Arguing semantics: Disregard weight classes. We’re talking skills, difficulty of opponents at the time they fought them. Not if Cotto can make 135, or if Crawford can be effective at 154-160.
Miguel Cotto’s best opponents:
Mayweather
Pacquiao
Canelo
Mosley
Martinez
Margarito
Clottey
Quintana
Trout
Judah
Corley
Malignaggi
Ndou
Mayorga
Ali
Geale
Bailey
Foreman
Bazan
Abdullaev
Urkal
Sosa
Torres
Branco
Rodriguez
Gomez
Pinto
Maussa
Terence Crawford’s best opponents:
Porter
Postol
Gamboa
Burns
Beltran
Brook
Khan
Horn
Kavaliauskas
Dulorme
Avanesyan
Benavidez Jr
Indongo
Diaz
Prescott
Klimov
Jean
Lundy
Molina