Leon Simmons played 2 games at Linebacker for Denver in 1963.
Jim Fraser was drafted by the Cleveland Browns in the 21st round (250th overall) of the 1959 NFL Draft. He seems to have dropped off the grid at that point. Jim reappeared in Denver around 1962, donning #55 for the Broncos for 2 seasons. In his 3rd and final year in the Mile High City (1964), Fraser wore #51. He also went to the Pro Bowl for the third consecutive year. For the season in question, Fraser had one interception. But it was his punting that got him the All-Star status. Jim punted 73 times in 1964, with a 44.2 average and a long of 67 yards.
Eugene Jeter was drafted by the Denver Broncos in the 10th round (73rd overall) of the 1965 AFL Draft and the Green Bay Packers in the 12th round (164th overall) of the 1965 NFL Draft. Opting for Denver, Jeter played 3 seasons (1965-67) for the Broncos and appeared in 30 games.
Henry Sorrell played 10 games at Linebacker for the Broncos in 1967, recovering one Fumble.
Dave Tobey was drafted by the Pittsburgh Steelers in the 10th round (130th overall) of the 1965 NFL Draft. For some reason, he ended up playing for the Minnesota Vikings in 1966 and 1967. He played in 7 games for the Broncos in 1968.
Gordon Lambert was drafted by the Denver Broncos in the 4th round (91st overall) of the 1968 NFL Draft. He played 2 seasons in Denver (1968-69), but only wore #51 in 1969 when he played 4 games for the Broncos.
Tim Casey suited up for 2 games for the Broncos in 1969.
Bill Butler played in 14 games for Denver in 1970.
Mike Simone played 3 seasons in Denver from 1972 to 1974. He started 3 of 42 games, recovering 3 Fumbles and returning one kickoff and one punt for minimal yardage.
Mike Croel was drafted by the Denver Broncos in the 1st round (4th overall) of the 1991 NFL Draft. The No. 4 pick overall in the '91 draft, Croel was forced into the lineup by an injury to starter Tim Lucas. He ended up with 84 tackles and 10 sacks, forced four fumbles and was named NFL Rookie of the Year. Following his Rookie campaign, Mike failed to meet Denver's expectations of the 4th overall pick. There were various reasons for that. When Croel was a rookie, the coaches kept things simple for him: His only job was to rush the passer. With added responsibilities, his effectiveness waned. Another good reason was that he was dyslexic, a condition he fought from childhood. He started 54 of his 58 games in 4 years with the Broncos, recording 24 Sacks, 2 interceptions, one for a touchdown and 3 Fumble Recoveries. after playing out his Rookie contract, Mike had one-year stints with the New York Giants, Baltimore Ravens and Seattle Seahawks. He also played for the Los Angeles Xtreme of the XFL in 2001.
Jamie Winborn was drafted by the San Francisco 49ers in the 2nd round (47th overall) of the 2001 NFL Draft. He played 5 years for the 49ers before being traded to the Jacksonville Jaguars. Jamie spent a year there before moving on to Tampa Bay the next year. On September 11, 2007, Winborn joined the Broncos. In two years with the team he started 13 of 30 games, recording 133 tackles, 12 pass deflections and a Sack. The Broncos released him on February 16, 2009.
This was a little too close to call and in the event of a tie, the membership should make the decision. Personally, I give the slight edge to Mobley for the extra ring and being a part of the first of two Super Bowl victories, but I can't find fault with anyone who would choose Swenson here. MHR gives a Mile High Salute to bob Swenson and John Mobley as two of the Greatest players to wear #51 for the Denver Broncos.