Yeah, there's probably a threshold limit to what it could take, but her walking around in the armor wouldn't have stressed it by any means. I definitely think even from BBS, Aqua was planned to have a fall to Darkness one way or another, 0.2 flirted with this a lot. Since we never did get BBS Vol. 2 (and that game was hinted in BBS Final Mix I believe), I really think that this was a concept he had planned for a while now. Because BBS Vol. 2 would've most likely touched on stuff from 0.2, just much more fleshed out.