Toxic in what sense, disruptive, a big time Charlie that would rub folk up the wrong way?...
He's always been a good pro at Utd and a very popular person/player so I fail to see how he'd be toxic at this stage in his career?! I actually think he'd be a really good influence. The young lads will want to know of his experiences and ask him about his achievements and I think they would take a lot on board from him. He's a leader, a winner and would be a popular figure amongst the squad and an asset on the playing side also. But that's just my personal view.