With the MD glyph and intimidation talent, he should do okay for holding aggro. Yeah, I'll rip off my pets if I go damage hose, but usually just kind of watching it - I do alright.
Sofia, the remarkably purple spirit cat as drawn by Ket Shi.
I never have any problems with a Spirit Beast, or any ferocity pet, holding aggro and I don't even use MD and very rarely have to use Intimidation. I have never used a Tenacity pet in my 5 years of playing my Hunter. Having said that, I still have yet to see this guy spawn. I have been looking in earnest now that Northrend is comparatively empty and still never see him. I have spent 4 hours at his point on a few occasions and nothing. I have every Spirit Beast but him.