Didnt knew this about Cotto. Interesting, would never had tought so. While is money punch was the left hook, his right hand was very good also. Id be surprised of it was actually the case with Tyson. Guy is so scrutinized that it would be known Ruddock is another converted southpaw, unsurprisingly
I've always found it weird how there have been so few elite southpaw heavyweights. I mean it took over 100 years for a southpaw to win the heavyweight title, and from what I remember a modern great like Lennox Lewis went his entire pro career without facing one (I think the same applies to Tyson but I'm not 100% sure).
Lewis fought a switch-hitter once early in his career, but IDK if he ever fought a pure southpaw. Conversely, Wlad had at least 7 fights (just that I can remember) against southpaws in his career. Go figure.