(Psi)SeveredHead
Adventurer
The sub-disciplines are not that big of a deal -- you don't NEED all 6 ability scores to be good, you only need the ability scores to be good that you plan on manifesting powers from. This almost naturally creates a heirarchy of powers. Someone with the Default Array of 15, 14, 13, 12, 10, 8 would probably have their 15 in the ability they most wanted to use (so a Seer might put it in Wisdom), ranging down the line for powers that they'd enjoy having, and then the 8 would go in something they wouldn't mind loosing (Like Str, because he's a fricken' PSION, why'd he be up in the front?!)
Really? And what will this Seer do at the higher levels?
No discipline is capable of everything, something MAD-proponents continually forget.