Dalrymple's been called up to replace Giles, more for his all round ability (30+ with the bat, 24 wickets at an average of 40 in C1 last season) but I'll bet he play as second spinner at Sydney with Mahmood / Anderson being left out.
But he's not a front line spinner.
Giles may be around for a couple of years more, and may be happy to play experienced second fiddle to Monty, faililng that Min Patel of Kent.
Rashid's a young Tyke leggy who got Botham very excited last season and I think he'll be nurtured over the next couple of years.