He brought in Testaverde, who wasn't actually good but had the league's #1 defense and a strong running game. Testaverde in 1994 had 16 TDs and 18 INTS, and no, that wasn't good even back then. They were also 3-0 that year with Mark Rypien.
For whatever reason the narrative is that Bill was ballsy to move on from Kosar. In reality, Testaverde's QB rating in 1994 (70) was far worse than Kosar's in 1993 (77) and 1992 (87).
The fact is the 1994 Cleveland Browns were a good quarterback away from being a real championship contender. They scored 29 points in two playoff games.
What concerns me is that Bill has gone with that Parcells idea of the steady eddie quarterback who is coachable, reliable, though not necessarily good. They signed on Testaverde in 1998 with the Jets, and again, it's not a surprise they were overmatched by John Elway in the AFCCG.
Parcells then went with Bledsoe (!) again when he went to Dallas, even though Bledsoe, like Testaverde, is a guy you can't win with in the modern NFL. He just isn't good; worse than average by that point.
And Belichick? The Cam re-signing is concerning as hell...basically the same exact theme...a guy who is a locker room leader, coachable, etc. but almost exactly like Bledsoe/Testaverde: a former #1 pick, downside of his career, not going to get you to the next level.