I didn't stereotype undrafted players/QBs as failures. I said undrafted QBs rarely, if ever work out. So I go back to my original post of why people were expecting Brock to be capable of playing at a level higher than he should have to. He was undrafted, so why should he be expected to be able to play at the level of Alex Smith or Aaron Rogers? He should only have to play at the level of fellow undrafted players at which he did and excelled. If he was known to be capable of playing at a starter or second string level he would not have gone undrafted in the first place.
But it doesn't matter because he's gone now, if he makes the PS then great if not then he'll just have to succeed somewhere else.