Read between the lines. He can't prove his innocence without also proving someone's guilt, hence why that will never happen.
Man Utd are implying that there IS context which can be applied to the leaked evidence that puts him in the clear. The problem is that the context probably incriminates somebody else...
I read it as United don't know shit apart from what MG claimed.
What they called internal investigations are probably just MG infront of a 3 men Ethical committee asking "What happened?"
1. We have no jurisdiction to uncover evidence
2. We have legal implications in tampering with all the evidence, I don't think a Football Club has the rights to deal with these sort of Investigations
3. Any sort of "Findings" would just be MG telling him his stories
And logically, what's more damaging than a Rape / Physical assault, what other incrimination could be more damaging? The fact that they have nothing plausible brought forward meant for me it's just face saving of "we did our due diligence" and probably the "Mason is alright" was part of the deal to make him drop all future charges of being terminated
On top of my head
1. That MG was not alone and he's with a group of friends and that the new proof could have implicated more names, but that's equally worse than 1 person Rape / Physical Assault
2. BDSM Game?
3. Psychotic Amber Heard Femme Fatale that MG loved and trying to protect? But he's the one caught assaulting her. At least Johny Depp never assaulted Amber
4. Boris Johnson was present and it could present a national scandal?
So what other possibility is there that could 100% exonerated MG out of his doing? Even at my wildest imagination i can't think of any