Question: Who was in the copyright with David McKenzie for the game system which is the base of Living Steel?

Context paragraphs:
Living Steel: Living Steel was a high-tech role-playing game published by Leading Edge Games and based on their Phoenix Command game system.  The rules were presented first as a box set in 1987 and then republished in a single hardbound book in 1988, but they are now long out of print and their publisher defunct.

David McKenzie (cyclist): David McKenzie (born 6 August 1974) is an Australian former racing cyclist.  He won the Australian national road race title in 1998.  McKenzie's biggest victory came on stage 7 of the 2000 Giro d'Italia where he rode to victory after a 164 km solo breakaway.  McKenzie won the Goulburn to Sydney Classic in 2005.  He now works as a cycling journalist and commentator for Australian broadcaster SBS.

David M. Moffett: David McKenzie Moffett (born February 22, 1952) is an American businessman and was formerly the CEO of Freddie Mac.  He was previously an executive with U.S. Bancorp.  He also served as senior advisor to the Carlyle Group, and has been a director at eBay since July 2007.  On March 2, 2009, Moffett announced his resignation as CEO of Freddie Mac.

David McKenzie (fencer): David McKenzie (15 July 1936 – 10 August 1981) was an Australian fencer.  He competed at the 1956, 1960 and 1964 Summer Olympics.  He was an International Olympic Committee member from 1974-1981.  He replaced Lewis Luxton who had resigned.

Tony Lamb: Antony Hamilton Lamb {'1': ", '2': ", '3': ", '4': "} (born 7 March 1939) is an Australian former politician.  Born in Horsham, Victoria, he was the son of Victorian Country Party politician Hamilton Lamb.  He was educated at the University of Melbourne graduating on 14 August 1971 with the Degree of Bachelor of Arts and then the Victorian College of Pharmacy, becoming a pharmacist.  In 1972, he was elected to the Australian House of Representatives as the Labor member for La Trobe.  As a backbench Member in 1973 Lamb, together with fellow Labor Member David McKenzie, introduced the Medical Practice Clarification Bill which, if passed, would have allowed abortion in the Australian Capital Territory.  The bill was defeated after a conscience vote on 10 May 1973 by 98 votes to 23.

Atari Joystick Controller TV Video Game System: The Atari Joystick Controller TV Video Game System was made in 2003 (copyright 2002) in Jakks Pacific's Plug It In & Play TV Games plug-n-play game system lineup.

Bill McKenzie, Baron McKenzie of Luton: William David McKenzie, Baron McKenzie of Luton (Bill McKenzie) (born 24 July 1946) is an English Labour politician and, up to the General Election of 2010, was Parliamentary Under-Secretary of State at the Department for Work and Pensions and the Department for Communities and Local Government.  He is also a former Partner at accounting firm Price Waterhouse which became PricewaterhouseCoopers following a 1998 merger.

David McKenzie (economist): David McKenzie is a lead economist at the World Bank's Development Research Group, Finance and Private Sector Development Unit in Washington, D.C..  His research topics include migration, microenterprises, and methodology for use with developing country data.  He is also a contributor to the World Bank's Development Impact blog.  He is also affiliated with the International Growth Centre and Innovations for Poverty Action.

Phoenix Command: Phoenix Command was a role-playing game system published by Leading Edge Games, and copyrighted by Barry Nakazono and David McKenzie.  Various versions of the system featured in the games "Morning Star Missions", "Living Steel", and "Aliens Adventure Game".

David McKenzie Log Cabin: The David McKenzie Log Cabin is a historic house located within the Mountain Homeplace in Staffordsville, Kentucky, United States.  The cabin was built between 1860 and 1865 by David McKenzie, who was an early settler of Johnson County.  It was originally located at , in Volga but was moved to the Mountain Homeplace in the early 1990s by the U.S. Army Corp of Engineers.  It was added to the National Register of Historic Places on January 26, 1982.

Supporting paragraphs: Living Steel Phoenix Command
Answer: Barry Nakazono