I have spent a bit of time trying to find these stats this morning and they're not available to the public. Only clubs would record these stats internally and unless someone on Blitz goes over the game and marks each kick outs in terms of effectiveness, score involvement, f50 entry... it's too tough for us to know.
The only stat available to me is disposal efficiency which his seems to be good. If he kicks to himself, this counts with his disposal effectiveness. This is why I believe it might not be as bad as we all think. So unless there are any other indicators that point in the way of him making mistakes rather than times we've noticed him make a mistake, there is not too much reason to panic imo.
I did see Wim's post highlighting his concern with BJ kicking in a few rounds ago. With no data, it's hard to judge.