You are right, he has dropped his assessed average ( although cup matches don't count towards gsa as u know)
But seeing as he hasn't seen any of the tracks, and he is learning on the job,he should pick up in the 2nd half of the season, if given the chance.
This season going by your points/ rides he is averaging 3.66 at home, 2.66 away for an overall average of 3.16 so far. Surely he will only get better.
I would guess that Ricky Wells might be more of a concent at the moment.