i think it is very unfair to allow the best troop, let alone let you max it out, at a town hall 9. It ruins the incentive of having a Level 10 Town Hall. This allows TH9's to be way overpowered making wars unfair to say the least.. An army of 3 lvl 2 lava hounds and the rest lvl 6 balloons with 4 or more endurance spells allows you to 3 star over 50% of the TH10's out there..

