As bad as Robert Royal was (and he did suck elephant), besides the 37 games he started in Buffalo, he also started 29 games in Washington previous to the Bills and 15 games for Cleveland after the Bills.
That's 81 games started in the NFL. Also he was one of the league's best blocking tight ends.
He honestly doesn't belong on the list.
In his place, I nominate Eason Ramson.
http://www.pro-football-reference.com/players/R/RamsEa00.htm
Similarly Kelsay sucks big time but A) he's not really a linebacker and B) he has started 119 games in the NFL.
Clearly he's not the guy for this team we're assembling.
In his place, I nominate Paul Guidry.
http://www.pro-football-reference.com/players/G/GuidPa20.htm