The only thing that I don't agree is wearing any head gear, again, we've seen older fighters like the recent Tyson vs Jones, without any head gear. Tyson can still punch, Roy Jones admitted that he felt the power, but they fight without any head protection and I'm sure either Cotto or Marquez doesn't want any.
I have no idea whether there is a specific clause in their match agreement which states that both fighters are required to wear a head protective gear. There may be such a condition, there may be not. I guess it will depend on both of them. But I am expecting that the rules for this one will be tailored fit for old retired boxers who are more prone to injuries and who will probably suffer more should such injuries are inflicted. The rounds may be shortened, gloves thicker or more padded, etc.