I've been very impressed by Isaac. Didn't think the bloke had anything to offer at all... up till the end of last year I was convinced he had a weak kicking game, little spark with ball in hand and an inability to organise. He wasn't really that flash in U20s, he seemed to be made to look decent by a crack hot U20s side.
However, wow, the improvement in him blows me away. Well Isaac! As to whether he should usurp the Buster/Maloney combination, I don't think so. Seymour is such a good organiser and Maloney is the scrapper who seems to take advantage of opportunities. Perhaps interchange hooker?