Brown's a good young prop and will be a solid SL player over the next few years but ultimately there will be one thing that holds him back from becoming top quality imo and that's like a lot of our young forwards his size (or lack of), unfortunately it's the same with fash, lane, cator, laidlaw.
I'd personally put brown and someone like storton (who he'd likely replace?) in a similar bracket in terms of ability and potential.
Whether he goes across there or not remains to be seen but he's got more chance of playing every week here at the moment, but we've all heard this rumour before.