Here's my prediction:
Brady in for one series; o-line doesn't look so hot and he gets sacked or hit, so he is immediately removed from the game without anybody getting any good looks at him and his new receivers.
Mallett comes in and is uninspiring. Maybe he scores one TD, but only if the Eagles back-up D is in.
Tebow plays most of the game, and looks pretty darn good, but it is all against Eagles back-ups, so all of his swooning supporters over-rate his performance. Since BB hates to lose even preseason games, the Pats try real hard in the 2nd half and either win or lose a close one.
On D our starters play one series. They look fine and get the Eagles off the field. After that it's the scrubs and they are all over the place, allowing some big plays, but making a few too. Play is inconsistent and sloppy.
Fans are scared/frustrated by this performance. We over-analyze it all week long and can't wait for the next one!
Edit - forgot to all that at his presser BB says, we made some good plays, we made some bad plays, we still have a long way to go...