I'm not in any way saying they should have brought Sanchez back. He's a bottom third QB. But that's part of the problem. Horrible cap management and talent evaluation by Tannenbaum led them to that mistake. Rex is a very good defensive coach but did pretty poorly in his selection of coaches.
As far as I can tell, all the talent there was brought in by Mangini, and it got old. Tannenbaum only took personnel power once he left, and the owner is the one who made that mistake. Why would a cap guy know talent evaluation?
https://twitter.com/vitostellino
Beat writer covering the Jags. If you want to see some good trolling of NFL GMs, read his timeline on Nov 20. It's amazing