Wait, wait, wait.
Hate to break the awesomeness loop, but he has a thunder/plasma/fancy hammer in ADDITION to the flamer? Why not a ttau plasma rifle/twin-linked plasma rifle?
He has only a dozen or so missiles, maybe even twice as much, but why all the close range focus?
Or he has some kind of hybrid Ttau Hellgun on his spare arm or in the shield?
Might not be quite stormbolter efficiency, (maybe nigh-unlimited ammo from reusing the suit's excess heat?) but at least he could still threaten most enemies to a decent degree without wasting a missile / even after he's out of them.
Oooh, and that WOULD be a nice way for the ttau to improve the fairly simple design of the shield. :3
A rapidfire weapon of some kind, having it concealed giving an extra advantage. Or maybe it could be like a sidearm mounted to the helmet, giving him a similar advantage to the striking scorpions?
(Gotta respect an enemy that can pop your head by looking at you; devastating in melee fights)