Question: Are David Usher and Gregg Allman both from the same band?

Context articles: Just Before the Bullets Fly
Duane &amp; Greg Allman
I'm No Angel (album)
Gregg Allman Live: Back to Macon, GA
Win, Lose or Draw (album)
Midnight Rider (film)
Gregg Allman Band
David Usher
Gregg Allman discography
Gregg Allman

Just Before The Bullets Fly is the fifth studio solo album by Gregg Allman and the third album released under the Gregg Allman Band monicker.
 It was released on Epic Records in 1988.
 The album peaked at number 117 in the "Billboard" 200 chart.
Duane & Greg Allman is an album credited to Duane and Gregg Allman, released by Bold Records in May 1972.
 The release is essentially an album-length demo recording of the 31st of February, a Tallahassee-based folk rock band featuring drummer Butch Trucks, bassist David Brown, and guitarist Scott Boyer.
 The 31st of February formed in 1965 and released their first, self-titled album in 1968.
 This second recording, according to Trucks, was intended to be their second album.
 It features Duane Allman on guitar and Gregg Allman on vocals.
 The two had been performing with the 31st of February for several months.
I'm No Angel is the fourth studio album by Gregg Allman, released on Epic Records in 1987.
 The album is particularly notable for the strength of its title song, which was later covered by others, including Cher, Gregg Allman's former wife.
Gregg Allman Live: Back to Macon, GA is the second live album by American singer-songwriter Gregg Allman, released on August 7, 2015 by Rounder Records.
 Recorded at the Grand Opera House in Macon, Georgia, the CD/DVD package showcases Allman's eight-piece solo band.
Win, Lose or Draw is the fifth studio album by American rock band the Allman Brothers Band.
 Produced by Johnny Sandlin and the band themselves, the album was released in August 1975 in the United States by Capricorn Records.
 The band had previously released their fourth record, "Brothers and Sisters", in 1973 to critical and commercial success.
 The band toured the following year, attracting large crowds and earning substantial amounts of money, all while internal tension grew between the members.
 Vocalist Gregg Allman and Dickey Betts released solo albums — "The Gregg Allman Tour" and "Highway Call", both issued that fall — which prompted speculation on the band's unity.
 It was the last album to feature bassist Lamar Williams and pianist Chuck Leavell.
Midnight Rider, also known as Midnight Rider: The Gregg Allman Story, is an uncompleted American biographical drama film.
 Director Randall Miller co-wrote the screenplay with Jody Savin, based on the autobiography "My Cross to Bear" by the singer Gregg Allman.
 Miller and Savin were also the producers.
 The film was to star William Hurt, Tyson Ritter, Zoey Deutch, Eliza Dushku, and Wyatt Russell.
The Gregg Allman Band, also known as Gregg Allman & Friends, was a Southern rock/blues rock group that Gregg Allman established and had led since the 1970s, during periods when Allman has been recording and performing separate from the Allman Brothers Band and has chosen not to perform exclusively as a solo artist.
David Usher (born April 24, 1966) is an English-born Canadian musician, best-selling author, keynote speaker and activist, known as the lead singer of the alternative rock band Moist.
The following is the discography of Gregg Allman, an American singer-songwriter and musician, also including releases from the Gregg Allman Band.
 Allman released his debut studio album, "Laid Back", in 1973; it charted at number 13 on "Billboard"'s Top Pop Albums chart and went gold.
 His subsequent solo releases, including the live album "The Gregg Allman Tour" (1974), "Playin' Up a Storm" (1977), and the collaboration "Two the Hard Way" (1977) with Cher, did not fare well on charts or in sales.
 In 1987, he was signed to Epic Records, and his third solo album, "I'm No Angel", went gold on the strength of its title track.
 His next two solo albums, "Just Before the Bullets Fly" (1988) and "Searching for Simplicity" (1997), did not perform well.
 His final studio album released during his lifetime, "Low Country Blues" (2011), represented his biggest chart positions, including at number five in the US.
 A posthumous studio album, "Southern Blood", was released on September 8, 2017.
Gregory Lenoir "Gregg" Allman (December 8, 1947 – May 27, 2017) was an American singer-songwriter and musician.
 He was known for performing in the Allman Brothers Band.
 Allman grew up with an interest in rhythm and blues music, and the Allman Brothers Band fused it with rock music, jazz, and country at times.
 He wrote several of the band's biggest songs, including "Whipping Post", "Melissa", and "Midnight Rider".
 Allman also had a successful solo career, releasing seven studio albums.
 He was born and spent much of his childhood in Nashville, Tennessee, before relocating to Daytona Beach, Florida.