So even though I see this issue both ways, I'll say this: There have been several times over the years where my professor entrusted me to live roll with the new(er) white belts that had some pretty clear signs of an acai-heavy diet until they either quit or toned down the spaz factor, this being after injuries were sustained by others of similar experience level. Typically, I would spend roughly the first 60-90 seconds of a five-minute round either maintaining guard with an elbow mushed into my face while he spazzed out trying to pass or being slammed repeatedly during scrambles. This process would generally result in gassing, at which point I'd be able to sweep/submit.
My point is, on pavement and with any and all wild strikes allowed, I'm not willingly jumping into that scenario unless I absolutely can't avoid it. So yes, to a degree strength/size present an X-factor for those of us with healthy egos.
