Mentally not seeing the game and never really the same since injury. Sometimes sees the right read, but happy feet and doesn't step thru throws or happy feet and runs when shouldn't. Way too many analysts see the same thing where is missing the reads and pre-reads.
Now, coaching staff has embedded further doubt on his status and just don't see him staying (unknown, but expect him to move to fresh scenery and no competition pushing him). Klein's off always predicated on run oriented (what Elko wants to control clock...similiar to Jimbo's thoughts), use of TEs (which just not seeing) and a running QB (not a Marcel, but typically enough to keep chains moving).
Think Klein has tried to change to fit CW and CW just didn't adapt (again, playing too fast in his head and pre-panicking and tunnel vision, late on throws and then poor mechanics).
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Play for the name on the front of your jersey, not the back...