I managed to beat Titan story mode with my i180 Monk. Took about half a dozen tries, but I managed to time GS to keep my stacks into heart phase and blow him away with fully buffed Forbidden Chakra and Tornado Kick before he could cast Gaol. If he even so much as starts to think about casting it, you're too late since the gaol still traps you as he's being incapacitated. After heart phase, I beat him before I ever saw him cast another gaol.