Again, extrapolation is what people do when faced with a lack of solid physical evidence.
It's a stretch no matter how anyone tries to justify it. Just is. I mean, you can if you want to, but it's a stretch. The fact that it takes a lot of supposition to reinforce the hypothesis means it's kind of flimsy by default. Plus, it's fictional, and thus can never be proven, so yeah, anyone could potentially spin any argument they want to support their opinion.
If we're being realistic, though? Nah. There's three basic movements that consistently and reliably measure pure strength and explosive power: squats, dead lifts, and presses. With heavy weight in any of those three, I honestly can't see Mikey putting up more than either Leo OR Raph. Respectable numbers, sure; but he's not a powerhouse and there's never been anything given to suggest that he is. All the roles have always been pretty clearly defined, to me: Raph's the powerhouse, Mikey's the quickest, Leo's he all-around leader and Donnie's more a support role. Those things have all been pretty consistent across various interpretations, give or take.