Player position and defender position is factored in. The other intricacies you mention are why xG is not a suitable metric for the accurate depiction of a single game or even several games.

Rather, it’s far more suited for analysing performance over tens of games or entire seasons and can help to highlight problems in chance creation, finishing, or with specific players etc.

Bit of a nob but if he didn’t finish with a year at Villa, maybe John Terry.

But Totti.