Yesterday, when me and two other wizards were fighting him, he only called his minions one time. Usually he calls them back after like 2 rounds, but he never did. They stayed gone the entire battle after we took them out. :-o
I have also noticed this, he seemed a lot easier than any of the other times I have fought him, if you ask me I think it's better cause it used to take me and some friends an hour to beat him even though we knew how to fight him. :) I hope that some time soon I can get a sea dragon drop from him