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Now, if you don't take stamina ... you have 3 more powers you can pick up elsewhere.
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I have always thought that taking the Presence Power pool would absolutly fit this build.
Since Stamina and Hasten are both easier to skip with MMs, It seems like a good oportunity to take this pool. In the end you will have the AoE fear, the single Fear as well as Fearsom stare. This leaves you with basically a set of 3 hold powers.
Also, why not think of Howling Twilight as another AoE Hold (even if it is a disorient, most likely the mob is also in a tar pit so it might as well be a Hold) AND debuf power?? Slot this for 2 tohit debuf, 2 disorient, and 2 recharge. Am I not mistaken that this autohits??!! Even if it doesn't autohit, you still have a Dominator-ish ability to control a mob while your pets take care of things.
Oh and with all of hold-like activity going on, in theory at least you don't have to spam the heals as often.
Granted since I've never crunched numbers or played this idea, I don't know if you wind up needing Stamina after all.
Just a thought.