I tend to think of "during UTH" as more of the period of time during which the story arc happened than
I count his appearances in Robin as OOC as well, and let's not forget the wondrous work of Bruce Jones in his appearance in Nightwing (actually, let's). Plus, while he had some IC appearances in Countdown, he had a fair share of OOC ones, too- probably the majority.
I suppose you're right, though- it is closer to half and half. His OOC appearances were considerably more memorable- and, sadly, influential- than most of his IC ones, though.