What makes you say that? I find it surprising that the Colts and Redskins were interested in him in the 3rd round, especially since they got great QBs in the first round. Unless the plan was to "Kevin Kolb" Russell Wilson, I don't think it would have been a great idea to take him so early.
We were eyeing him in the 4th round where we took Kirk Cousins, not the 3rd where we passed on him for a guard. It's been a generally accepted fact that Rex Grossman isn't likely to stick around for very long (he was a free agent and we only gave him a one year deal), so we were going to have to try and develop someone as a backup sooner than later.