Yes, I'm sure he must have gone back in between the summer of '63 and the summer of '67. For instance, what about that year he tells Ennis he nearly starved? (?1964 or 5?) And he must surely have gone back to tell them he was getting married, if not to invite them to the wedding. I just assumed that he visited Aguirre the second year on his way to or from LF, then after that was too tied up with rodeoing, getting married and being involved ( or not) in Lureen's pregnancy and giving birth to do more than go up quickly now and again. Once the baby was born, LD and his wife made it pretty clear he was redundant in their opinion; that's when I think he both felt more of a need for Ennis and had time to try to make contact.