I have been a huge Cotto fan, but I can´t see him as an ATG. I would add Floyd on list. Roman Gonzales, Guillermo Rigondeaux, Sergei Kovalev, Gennady Golovkin and Andre Ward have good chance to achieve ATG status but it depends what they are going to do in the next 2-3 years.
Wladimir Klitschko - one of the greatest heavyweight champions in history Roy Jones - won titles from middleweight to heavyweight, looked spectacular in his prime Bernard Hopkins - longevity Manny Pacquiao - won titles in 8 (?) weight divisions It depends what do you require from a boxer to consider him an all-time great, but these guys are likely to be included in any kind of criteria.