I was just wondering cause it seemed like he was around a lot more as Gavan O'Herlihy, then he was the next season as Randolf Roberts, if anyone can clear this up I'd appreciate it. Thanks

Well, they did do the episode where Richie moves into Chuck's apartment for a while, but that was the season with the second Chuck. So maybe he lived at home the first, then away the second, then somewhere in oblivion the third...