I had forgotten about this, but Todd Bell actually returned to the Bears after the 1985 season. I thought he had left and gone to Philly with Buddy Ryan in 1986. Needless to say, the alleged best player on the 1984 defense couldn't regain his starting job from Dave Duerson and was a backup in 1986 (perhaps explaining why I had forgotten about him). When Fencik was at the end of his career in 1987, the Bears moved Duerson to FS and Bell got his old SS job back for one year, and in 1988 Bell was on Buddy's Eagles. What I do remember is Bell's coverage skills had deteriorated to a point where Buddy actually converted Bell to OLB...which is kind of remarkable even back then...a 6-0 ft 200 lb OLB. Bell was the worst player on the defense, and in 1989 he was shifted back to SS for a few games before his NFL career ended.
Buddy Ryan's impact on Todd Bell's NFL career is interesting. First, a guy who was undersized even for a SS and had no coverage skills like Todd Bell had no business even playing in the NFL. Buddy Ryan used Todd Bell like he did Doug Plank (another undersized, no coverage skills player) and Bell had a nice 1984 season. So in some sense, Ryan "made" Todd Bell into an NFL player. The problem was that Ryan was ALWAYS anti-management, and he supported Todd Bell's ill-conceived holdout in 1985, going so far to call Bell the Bears 1984 defensive MVP (which only the most limited of intellect took at face value). Ryan said it was fine if Bell missed the 1985 training camp, and guaranteed Bell a starting spot as long as he reported for Week 1 of the regular season. Things didn't play out that way, though.
When Buddy Ryan went to the Eagles, he tried to acquire Todd Bell from the Bears, but only offered a 6th round pick, which was laughable for a player that Ryan had claimed was the MVP of an all-time great defense. After Bell proved ineffective in 1987 while starting for the Bears, the team tried to trade him but found no takers. The Bears then placed him on waivers, but even then no team wanted to pick up his contract (not even Buddy Ryan). Eventually, the Eagles signed Bell to a bargain contract, and he ended his career there.
So Buddy Ryan created Todd Bell, and in a way, also derailed Todd Bell's career.