I don't think that it even tells us that, to be honest.
Lewandowski frequently underperforms on xG, for example.
I think that Son's xG is generally very good for two main reasons.
The first is that he scores when he's in behind defences pretty regularly.
This is expected and keeps him ticking over.
The second is his outrageous finishes from outside the box.
Very low xG and he does it with greater frequency than most.
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What's the xG on something like this on his "weak" foot?