Gray was selected in the third round of the 1973 NFL Draft by the Miami Dolphins. However, due to their depth at offensive line, he never played for the team. He was cut before the start of the 1973 NFL season and claimed on waivers by the New England Patriots. Gray was recommended to Chuck Fairbanks, who had just taken over as head coach of the Patriots, by an Eastern Airlines pilot named Bruce Kostamo who had played for Fairbanks in high school.[5] Gray played in the final nine games of the ‘73 season, starting eight at left tackle. He continued to develop during the 1974 and 1975 seasons and by 1976 he was viewed as one of the best left tackles in the game. Gray was not only strong at run-blocking, but in pass-protection, as well. He was a major factor in quarterback Steve Grogan being sacked only 14 times in 1977.[6] Along with guard John Hannah, the two formed what was generally considered the best guard/tackle tandem in the NFL.[7] Gray and Hannah also combined with tight end Russ Francis to form one of the strongest left-side trios in the league. At the end of the 1976 NFL season, Gray was selected to play in the Pro Bowl for the first time. Due in no small part to the efforts of Gray and Hannah, the Patriots enjoyed one of the finest seasons in franchise history in ’76, finishing with an 11-3 record. This earned them the AFC Wild card spot and a rematch with the Oakland Raiders. The two teams had met at Schaefer Stadium in week four of the regular season and the Patriots had handed the Raiders their only loss, a 48-17 drubbing. The rematch in Oakland would not go as well and the team’s hopes of winning it all were ended by a close and controversial loss to the eventual Super Bowl champions in the 1976 AFC Divisional playoff round.
https://www.patspropaganda.com/gray-was-selected-in-the-third-round-of-the-1973/