Forget the physical side, he doesnt have the brain to be playing high level football. It's possible he never did but his physicality made up for it.
His first instinct whatever is going on anywhere on the pitch is to lunge in. He charged out 20 yards to wildly lunge at Olise and completely missed him for their first goal. He was doing the same thing vs City in the FA cup final last year and was responsible for their goal in 13 seconds.
Every single goal you can apportion blame to him since he came here follows that exact same pattern. Charge out of position, lunge at someone, miss by miles, fail to recover to prevent the goal/cut back. And it's never necessary, he turns manageable situations into desperate ones.