I'm more interested in Paladin's than BK's and once Paladin's have been developed properly, there will be more basis for antithesis - giving BKs the opposite of whats developed for Paladins.
Just because you're playing a BK doesn't make them more or less important in the overall scheme of things.
I also think the BK concept is weak, but thats neither here nor there. Fanatical Death Cultists, daemon worshipper/summoners
Replace animate dead with a conjure demon [from corpse] - maybe Blob will hate that train of thought, who knows

But it would be more interesting to me at least.
And be that as it may, BKs are in the middle of planned development. When you try and work on too many things at the same time, nothing gets done but a bunch of unfinished, possibly good ideas.
Anyways blah blah blah blah blah.