That's certainly one possible explanation. Another possible explanation is that their brains are just faster in general, so that even though their type 2 system

That's certainly one possible explanation. Another possible explanation is that their brains are just faster in general, so that even though their type 2 systems are faster than others', their type 1 systems are faster yet and manage to override even more consistently than in others. In any case, I don't think it's something that's "obvious" or "expected" by any means, and I do think that it should bear further investigation.