Define "stronger"? How much force you can put behind a punch doesn't necessarily translate to lifting capacity or skill in wrestling; a BCV with a zero might can dish out rather more hurt than a mortal wrestler, but may not have the build (or leverage - remember, BCVs don't weight much) to effectively lift or carry heavy objects, or the skill to actually pin someone (which, again, requires leverage and an understanding of how your foes joints work, more than it requires raw strength.)
Still, if you want to put a might minimum on various levels of strength power in your game - that sounds like a perfectly fine house rule. I'd suggest taking a closer look at what the values actually mean, though - for example, I was designing a dragon with supernatural strength and hulking size, and it worked out that a might skill of three was about right - that's enough to casually carry a mid-sized car; more than that would've been overkill.