Another aspect to the debate that I have yet to hear broached:
We now know that Aaron Rodgers prefers over-inflated balls, evidently because it helps him in the downfield passing game (presumably in good weather conditions). So can we assume (for the sake of argument) that his footballs are maintained @ ~ 14 psi? And can we agree that Andrew Luck would be considered to have a similar (downfield, longer passing) game to Aaron's? So would it be reasonable to assume that his footballs are also maintained at ~ 14 psi?? In contrast to the above, we've never known Tom to be the prototypical "long bomb" passer, preferring the intermediate game. So I suppose it's fair to speculate that he'd be more comfortable with a ball at a lesser psi...maybe @ 12.5 psi, or dare I say a smidgeon lower? Furthermore, I could easily see how the lesser inflated ball would allow for a better grip, whether for throwing (accuracy) or running (less prone to fumbling). And we also know (see Peyton Manning, Eli Manning, Aaron, etc.) that these same preferences are maintained for all footballs used thoughout the season, whether that be in practice or actual games.
Bottom line: could a player such as D'Quell Jackson (and the rest of the Colts organization, for that matter) be more familiar with "seeing" 14 psi footballs throughout a long season of practices and games...such that the first time any of them "experienced" a 12.5 psi ball, which could only be experienced through the act of an interception (against a team like the Patriots, in those specific environmental conditions), they naturally thought it was "under-inflated"???
Has anyone even bothered to ask the simple question: What does a football at 14 psi feel like vs a football at 12.5 psi??
Note: Brady only threw 9 interceptions over the course of the regular season, and 2 of those were against the Colts (both by Mike Adams, a veteran DB).