Surely the best people to ask are CTC and then feed it back on here? Rather than asking them 'how many people are in the holdpool?' Why don't you ask how many will be in the FlexiCrew holdpool (which will be emptied first) then ask how many are in the Wings holdpool (which will be emptied second) and then ask how many are in the ATP holdpool (which will be emptied when hell freezes over I am afraid)?
They should be telling you, you shouldn't need to ask that here, unless you don't trust them......And don't be scared of the consequences of asking them either, you have a right to know, you pay them, not the other way around.