That could be it, too. All of the stands I've run into lately, with the exception of a few, are new; there's one that has some independence from its user, but it's not like Hierophant. They haven't had as much time as you have with their stands.
I didn't have him out a lot until the last few months, too, so that might be it as well.
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I didn't have him out a lot until the last few months, too, so that might be it as well.