In "Education of a Coach", Belichick says he felt he did a crappy job in the SB against the Panthers. The reason for this is he felt he didn't bring enough Defensive linemen into the game, and this eventually came back to bite him as his defense got worn out in the 4th quarter.
Ergo, instead of creating completely RIDICULOUS conspiracy theories about someone being sick, maybe Belichick simply wants depth at the d-line position?
This has no effect on the offense either way, if the gameplan depends heavily on a 4th or 5th wideout, then the Pats weren't going to win anyways.
As far as this (lololol) talk about EMOTIONS AND LOVE AND KARMA: jesus people, get a grip. First of all, there's no such thing as karma. There's execution. The only way this could affect the game is if it becomes a distraction for the pats, and anyone with a reasonable IQ should conclude Belichick hasn't let that happen. I'm sure Belichick did the best he could to handle this. As others have said, Underwood might be on the sidelines anyways. You can be cold and rational and still be empathic.
Cripes. Everyone relax.