Abel Sanchez, the trainer for rising star and long time champ Gennady Golovkin has a lot of words for his fighter when discussing the biggest fights in the sport. This interview took place just prior to the Murray fight and Sanchez was saying it would be good for Golovkin to go the full 12 in preparation for these super fights. That fight ended up going 11 rounds, which is the longest of Golovkins career and if Sanchez is correct in his estimates then Murray lasted longer than either Cotto or Alvarez would.
I do see where Sanchez is coming from with these statements.