it's not commonly known, but if released from the prison, and then have the game reset, you can use him also in the gargoyle fight (his sign is on the empty walk way where the second ladder is)
During the Gaping Dragon fight [if you've released him from his cell] yep! He's not really useful during the actual fight. It's just funny to have him on your side for once! Hehe.
you could summon him twice. it's not commonly known, but if released from the prison, and then have the game reset, you can use him also in the gargoyle fight (his sign is on the empty walk way where the second ladder is)