I made mention of the other day in the draft thread...but my money is on he can't draw up a play, do board sessions, and doesn't have it between the ears. "Bombing the interviews"...these interviews with QBs are mostly board work and seeing if the QB can retain information and jive with the headcoach/playcaller as they visit the facility, etc. Some guys get medical checks, etc.
Shedeur and the Sanders' family trying to dictate terms during these meetings might have just been a way to obfuscate his deficiencies and then it mades its way around the league.