No way did the Prep have more talent in '10 and '11. In '12 they probably did but whatever talent difference there was was at the underclass level, and in any case the championship game was decided by a PAT.
As for game plans, LaSalle had the better one in the '12 game and really should have been well ahead at halftime. Since then, especially in the last two championship games, the Prep has had the better plan--as well as more talent.
I agree that LaSalle's turnovers have hurt them in the last several games against the Prep, but it's not as is the Prep hasn't made any. (I think they made an equal number in the last game.) One key Saturday will be how well the Prep's passing game works. It doesn't have to be great but just good enough to prevent LaSalle from focusing almost entirely on containing SJP's ground game. Even then, unless the Prep fumbles a few times, their running game alone will put a few TDs on the board.