Light do work well with TK, as we are slow and low WS, but you already cover the WS part with the king.
I prefer our lore : it's weaker than some lore as he doesn't have a "roll 6 dice, win the game, go take a cold beer" spell, but ptra do wonder with archers/sphinx, the additionnal movement is huge, and neru is huge on halberd TG.

For the helm, people usually notice the normal blow that become a fatal blow. But you can have the inverse : a fatal blow that transform into a normal blow (or even better, a miss). I wouldn't really take that into account, as it's more a matter of luck than anything else.