To the point of the thread:
I'd say Singletary was the third "best" player on the defense behind Hampton and Marshall.
But I think he was the "most important" player because of what he meant to the defense in terms of his understanding of Ryan's scheme and his overall football intelligence.
Beat me to the point I was going to make. It's an impossible thing to quantify, of course, but Singletary fulfilled all of the cliches of "QB of the defense" and "like another coach on the field" etc. It would've been interesting to see how that defense performed without him running the show in the middle, but that's something we'll never really know because he lasted longer in Chicago than just about everyone from that defense. I don't think he was an incredible athlete like Wilber Marshall was, but he was still a force in the run game in the middle of that defense. And I don't think you have to be a freak athlete to be a HOFer. The way he owned the mental side of the game was impressive. And probably HOF-worthy alone. May not have had to make as many plays because of all the studs around him, but he could certainly make them.
And the one play that sums up Singletary, for me, is the stuff of Eric Dickerson on a third-and-one in the '85 NFCCG. The brains to know where the ball was going to be, and the physical ability to shut down a HOF running back in the hole. At 1:50 of this link:
[video=youtube;IeMO2Zg0Jg4]https://www.youtube.com/watch?v=IeMO2Zg0Jg4[/video]