Since there are maybe 5 or so people who own NSR's and can ride them to the limit to find the "flaws" with the MC28 swing arm (over the MC21), I think it's not a big deal

Even with a setup MC28, it still wasn't making the power to really get that swing arm out of shape coming out of corners. Now if I were to put the RS engine into that chassis? Sure, it would have twisted that swing arm all up.

I found out very quickly that I couldn't get on the RS hard at the apex like I could with the NSR MC28 (or MC21 for that matter). The NSR was such an easier bike to ride then the RS but the RS was much more fun (that damn front wheel was so hard to keep on the ground ).