In "Looking for Par'Mach in All the Wrong Places", Grilka's senior retainer (Tumek) takes Worf aside and tells him that he cannot pursue Grilka, as he is from a dishonored house. But hadn't Gowron cleared the House of Mogh? I feel like I'm missing or forgetting something obvious. Otherwise, my best explanation would be that although the House of Mogh was formally cleared, it was still regarded with suspicion by more conservative Klingons.