Maybe he's the Bruce Coslet of that group. Even Cos showed marked improvement in his first two years with the Jets and gave the Bengals a pulse in their dark days. He just had the second worst luck of any human being alive, right behind Patrick Ewing.
Coslet came in to "save" the Jets. Anybody in that situation is going to fail. The 1980's were a light in the darkness for Jets fans (little did we know) and the downtrend of the early 90's was very hard for the fan base to take.
He actually got them from 4-12 in Walton's last year, 1989, to 6-10 in 1990 with some close losses, to 8-8 and a Wild Card in 1991. The decline was set up by horrible drafting from the 80s Hickey/Walton regime and Dick Steinberg never bringing in good players. Walton and Hickey were living off of Walt Michaels' rebuilding job from the late 70s/early 80s because it was before free agency. Once that core got old it was all downhill.
I understand where your coming from here. But then again, if you're going to do that, you can probably break up the Walsh tree into 3 or 4 smaller trees.