Tolzien is fulfilling his destiny as a low-cap-number, career emergency backup who's better with the clipboard in his hands than with the football. That's assuming he actually makes the Colts final cut down. He simply doesn't process on-field fast enough for the NFL game. He evidently could not get a shot to compete as a starter with one of the handful of teams that are barren at the QB position, undershooting even my best case scenario.
When one considers McCarthy's insight into the quarterback position, the paltry cost to retrain Tolzien particularly in light of the Crosby and Perry deals, the fact Hundley has not taken an NFL snap, and the fact Tolzien is making a lateral move indicating the Packers did not have an interest in matching, Tolzien was not deemed adequate for the emergency role relative to Hundley.
Hundley provides one particular advantage that might be overlooked. In an emergency role, he'd present a style, threat and play list that runs counter to opponent expectations with respect to Rodgers. As we all know, Rodgers runs a downfield-first passing game, passing up checkdowns in favor of using his feet to buy time for the downfield throw. When describing Hundley two obvious traits come to mind:
1) A willingness to use his feet to move the chains, not just as a last resort.
2) Short pass accuracy, with a likely adjustment to a more traditional West Coast playlist to match.
That's not what the opponents' game plans are designed for, and unless and until Hundley puts up some tape over the course of a several games, he should be somewhat of a surprise, particularly in the division where teams have been seeing the same opponent doing the same things year after year.