Ahzur

Greetings everyone! This Christmas I got 2 stormdrakes as a present. I've never intended to run them in my lists, as I'm not a huge fan of spamming them (I know, you can kill me). I usually play the good old 4x fulminators, 6x vanguard-raptors, lord relictor, liberators/vindictors (depending on the points), and filling the rest with Bastian, Yndrasta, Aventis, imperatant + annihilators... My question is: now that I have these 2 stormdrakes, is there a point to run them as a filler of my core build (replacing something like the annihilators), or they are meant to be used in numbers and with the knight-draconis hero? I think I could make room for 2 drakes + a knight-draconis in my list, but I don't know if this would be efficient or not. The thing is that with my common build I feel like a sort of a glass cannon, and the drakes could be an anvil I could use. Thanks!