Question: Are David Paton and Robb Flynn both guitarists ?

Context articles: Unto the Locust
Nothing to Gain
David Paton (ophthalmologist)
Robb Flynn
Burn My Eyes
David Paton
Live Intrusion
Roadrunner United
Machine Head (band)
Phil Demmel

Unto the Locust is the seventh full-length studio album by American groove metal band Machine Head, released in Australia on September 23, in the UK on September 26 and worldwide on September 27, 2011.
 The album was produced and mixed by Robb Flynn, and it was the band's highest charting album ever, charting at 22 on the "Billboard" 200, until their following release "Bloodstone & Diamonds" charted at 21.
 "Unto the Locust" was recorded in Green Day's Jingletown Studios.
 On June 14, 2011, Machine Head released the advance mix of their album track "Locust", which was included on the 2011 Mayhem Festival iTunes sampler.
 This would be Machine Head's last studio album with co-founder and bassist Adam Duce before he was fired due to "ongoing differences" with the band on February 11, 2013.
 It has sold over 100,000 copies in the United States.
 At just under 49 minutes long it is the band's shortest album released to date.
Nothing to Gain is the third and final full-length album recorded by the San Francisco Bay Area thrash metal band Vio-lence.
 The album was recorded in August 1990, but wasn't released until 1993, after the departure of guitarist Robb Flynn.
 "Nothing to Gain" was re-released in 1997 with a different cover.
David Paton, MD (born August 16, 1930) is a retired full-time ophthalmologist best known as Founder in 1970 of Project Orbis (now named Orbis International, Inc.) and thereafter as its first Medical Director helping to develop (1970–1982) and then deploy its teaching aircraft for ophthalmologists worldwide, especially in the developing nations.
 The initial aircraft was a donated DC-8 refurbished to contain an operating room, a teaching classroom and the necessary ancillary components for sharing “live” both surgical and medical techniques with colleagues abroad who were eager to learn by means of hands-on instruction.
 The instruction was provided by volunteer American and other skilled medical teachers from an eventually large number of countries.
 In 1988, the DC-8 was replaced by a larger and more complete teaching aircraft complex, housed in a formerly commercial DC-10.
 Thus far 88 countries have been visited, some repeatedly.
 By 2012, still another update of the Orbis aircraft will be prepared to further fulfill the various purposes of teaching optimal eye care internationally, principally by means of doctor-to-doctor techniques.
 Paton resigned from Orbis in 1987 and focused on other aspects of academic ophthalmology, but in 2011 he returned in a voluntary capacity to assist in fund raising for a new annual appointment, the David Paton Orbis Fellowship in Global Ophthalmology
Robert Conrad "Robb" Flynn (born Lawrence Matthew Cardine; July 19, 1967) is the lead vocalist and guitarist for the heavy metal band Machine Head.
 Flynn formed the band along with Adam Duce, Logan Mader and Tony Costanza after leaving Bay Area thrash band Vio-Lence.
Burn My Eyes is the debut studio album by American groove metal band Machine Head, released on August 9, 1994 by Roadrunner Records.
 The album's themes generally tie into the social disorder and corresponding inner tension that the band was exposed to in their native Oakland, California, reflected in Robb Flynn's lyrics, such as the Los Angeles Riots of 1992 and the Waco Siege of 1993.
 The album shipped over 400,000 copies worldwide, becoming Roadrunner Records's best selling debut album until the release of Slipknot's debut album.
David Paton (born 29 October 1949, Edinburgh, Scotland) is a Scottish bassist, guitarist and singer.
Live Intrusion is a home video by Slayer which was released in 1995 through American Recordings and filmed at the Mesa Amphitheater in Mesa, Arizona on March 12, 1995.
 The video features a cover of the Venom song "Witching Hour" performed by Slayer with assistance from Chris Kontos and Robb Flynn of Machine Head.
 It was reissued on DVD on August 17, 2010.
 "Live Intrusion" received positive reception from the few critics that reviewed the video.
Roadrunner United was a project organized by the heavy metal record label Roadrunner Records to celebrate its 25th anniversary.
 It culminated in an album released worldwide on October 11, 2005, entitled "The All-Star Sessions".
 Four "team captains" were chosen to lead 57 artists from 45 past and present Roadrunner bands, and produce and oversee the album's 18 tracks: then (now former) Slipknot drummer Joey Jordison, Trivium frontman and guitarist Matt Heafy, Fear Factory guitarist Dino Cazares, and Machine Head frontman and guitarist Robb Flynn.
 The unprecedented project was the brainchild of Roadrunner UK General Manager Mark Palmer and Roadrunner USA VP of A&R Monte Conner.
 The album project was coordinated by Lora Richardson and was mixed by Colin Richardson and Andy Sneap.
 "The All-Star Sessions" spawned one single and music video ("The End").
 The DVD included with the CD purchase is a documentary of the "Making Of" the songs.
 It features the sessions of the four team captains making their songs.
Machine Head is an American heavy metal band from Oakland, California.
 Formed on October 12, 1991, the group was founded by vocalist/guitarist Robb Flynn and bassist Adam Duce.
 The current lineup of the band comprises Flynn, drummer Dave McClain, guitarist Phil Demmel and bassist Jared MacEachern.
 Machine Head is one of the pioneering bands in the new wave of American heavy metal.
Phil Demmel (born April 2, 1967) is the lead guitarist for American heavy metal band Machine Head, and is currently their longest running member in that position.
 He was also a founding member of Vio-lence, which also included Machine Head guitarist/vocalist Robb Flynn.
 Demmel was also a member of Torque.