Didn't the NFL already conclude that the Al Jazeera report was without substance by clearing Peyton? I mean sure, I think they were full of **** to do so, but if the report is valid, then Peyton's guilty and the NFL was wrong to clear him. If it's not, then there's no reason for these guys to be under any suspicion.
Those are the only logically consistent conclusions that can be drawn, anyway. If, say, Manning is operating under a special set of rules, or if this is just another completely arbitrary instance of Goodell flexing his unlimited authority for no other reason than that he can, then I guess this makes sense.
On the bright side, this really should hammer home to anyone who still doesn't realize it that Goodell is a ****ing clown who punishes people based on--according to his own previous statements and decisions--nothing at all.