He does have potential but he doesn't yet use his size as aggressively as he could. Having said that he's only just started the switch from second row to prop, which (despite Agar's middles nonsense) is a very different role. Him leaving would mean more hope pinned on Holroyd, or maybe the assumption is McDonnell will be a prop?
No idea who is available, but looking at our squad a halfback wouldn't go amiss. Austin/Sezer missed a lot of games last year, and its not ideal to have to move others out of position to cover. I get the impression Smith will not want to pick Sinfield or Simpson unless he has no other options due to their age.