Some anecdotal evidence for this; when I was fencing, I fenced right-handed for the most part. At one time, I switched to left because I injured my right shoulder, and I'm a stubborn ***. Both with the footwork and the hand motions, I was not as good with my left side. BUT, despite using my non-dominant side (so naturally weaker, although less so from MA), and not having practiced with my left side before, I was significantly better than an athletic person trying it for the first time. I'd attribute that to me having the mind for it already, except I was also better than some whom had fenced for years. I'd even win bouts in college tournaments against other collegiate fencers that had fenced for years.There's some scientific evidence that when you train one side, the other side still learns something. So, training one side much more heavily than the other might actually not leave the off-side as weak as we'd expect. Of course, that same principle means that when we train the off-side, we're strengthening the dominant side, too.
And it's definitely not that I'm just THAT good. It took me years to get to a point where I could actually compete and stand a chance against other fencers originally. It took me a week to get to that point with my other hand (although I never fully caught up...my 4 parry was always a tad too strong, so would get caught by a disengage fairly easily, and my counterattack was a tiny bit too 'joltish', so it didn't have quite the same effect...and those were two of my main 'techniques'). There's definitely a difference, but some training had to have occurred, otherwise everyone would have been wiping the floor with me.[/QUOTE]