To be fair, Jack is only just 21 so would expect him to improve all-round as he matures and spends more time playing at higher level of Prems and ASBP.
I have seen enough of him playing to know he has a good short game - but with Birkenhead's open and wide style of play you'll always see more of him moving the ball over greater distances. As for going to ground...he very often gets targetted early by opposition teams who want to disrupt Birkenhead's game.