You'd already had damage dealt to Latios once from SR +passive damage from hail. You hadn't removed them with rapid spin. You were going to take SR damage and hail damage again at least once. (Likely suffered 2 turns hail damage)
Lol, yes you won. But the misses mattered. They were crucial, in fact. The only thing I'm arguing here was the fact that you said, "Misses didn't matter." If it makes you feel better to think that, that's fine.
It was a GG besides those two misses. Both of us played fairly well, you just had more luck in this one, which is part of the game.
Once again, GG.