I think you can lock in Horne and Betham to start, with Taqele on the bench. Kellaway still has a long way to go before he's ready to play with professional adults, as I saw him (at the ground) in the Shute Shield twice later last year and when getting the ball on or just before the defensive line he just stopped dead (no step, no swerve - not keen to make contact). His finishing is impressive as we saw in the U20s and the NRC, though you don't get the same space in S15s as you might at the lower or junior level.
I think his positional play defensively is sound on the wing, though again there's more to be done in committing to either player X or player Y when it's not 1-on-1. This was pretty clear when he played fullback at North Sydney Oval.
Certainly looking forward to him starring for Gen Blue, and coming onto the bench when he's further developed (by those pretty handy developers we know and love) - though it remains to be seen if he can be more than just a bloody good finisher at S15 level.
Taqele also needs to do finishing school before he's ready to challenge for Betham's wing. Not sure what he's like under the high ball, and can he turn faster than Nadolo/Sailor? I'd like to see him take pressure off the forwards as much as possible (the way Tuqiri did, especially in 2007), and again he's in good hands at the Tahs.
I like Betham when he's hot, he can be awesome (eg. NPC a couple of years back) but when he makes one error it's often followed by 2 or 3 more. He loves combining with Izzy, and I look forward to some exciting play as long as he can keep himself fit.
Go Tahs!