I agree but I think he will beat it for a different reason.
The NFL wants Manning's legacy to stay in tact, unscathed and pristine so they will make it so.
The PR campaign has already started with their first statement on the matter. It was something to the effect of...
"The league will look into the report because it is something they feel obliged to do"
It's not about integrity here, it might not even be something they want to do. By saying they will look into it because the are obliged to do so they are setting the bar low for their own due diligence.