That is probably one of the things JP was thinking when he stated publicly that he wished that he (JP) had done more. Instead of saying, "You did the right thing", I'll handle it (or words to that effect), he should have said, "If you believe you witnessed a crime, go report it to the police - I'll handle the chain of command". Had Paterno done that, and had McQuery followed that advice, heads might still have rolled, but, at the very least, the statue would never have come down.
Why would Joe ever ask that if MM stated things in a manner to Joe that didn't indicate a crime? Joe isn't going to ask if a crime was committed when he gets an innocuous report of horsing around, or something along those lines.
What MM said to Joe, C/S/S is the #1 most important matter in this entire case as it pertains to PSU's culpability or lack thereof. MM's 2001 actions, and the actions of all those involved, line up perfectly if you assume MM didn't report sexual abuse and instead said something along the lines of horseplay. If MM witnessed a rape as he asserts in 2011, nobody's actions make sense, not even his own. This is all a case of he said she said, only the problem is everyone is trying to recall specifics from conversations that happened 10 years earlier. Unsurprisingly, they can't recall every detail perfectly.
MM may have created this entire mess by overstating what he saw 10 years after the fact, putting the entire university in hot water, when in 2001 none of this was viewed as such a serious matter and for a very good reason.
Did MM do that? I don't know, but it sure seems plausible based on everyone's actions. And that seems more plausible to me than everyone else (MM's dad, Dranov, Joe, C/S/S) dropping the ball if given a definitive report of sexual abuse, especially when you consider the outstanding reputation of most of the men involved.
If MM did strengthen his story, did he do it intentionally? Possibly, if he felt that JS was a threat to children for some reason he may have innocently thought that strengthening his report in 2011 would put a monster behind bars, without considering the collateral damage to everyone else involved. It's also possible he didn't remember the events in 2001 very clearly. I would estimate that an event of this magnitude would be quite clear in his memory, however.
The exact nature of MM's report is the epicenter of this entire scandal (as it pertains to PSU), and it's something we'll likely never get 100% clarity on given the amount of time that has passed.