Well, with Roost Mantine having won, I whole-heartedly am supporting Krook for the second-chance slate. Typhlosion is a nuke, but he's very susceptible to Hazards, and Gastrodon certainly gets a new role, but a new role which brings competition.
Pidgeot is an improvement, but the way it's played remains the same, and gives it something else Torn-T has that it doesn't in Fighting Coverage.
I have a bias towards Krook for one of my favorite designs, but Dragon Dance would also change up how he's played, and we've already seen evidence of how a set like his could work from Gyarados: 2-move coverage, Intimidate/Moxie, above average bulk, and a Thunder Wave immunity to boot. In fact, Krook and Gyarados could make a bit of an interesting Double Dancer core, Krook Intimidating and Knocking Off items in mid-game for Gyarados to sweep late game. This would allow Krook to outright beat rather than wear down Gyarados's checks and counters for him, the SR resistance means he can switch in more easily, and allows Gyarados to preserve his arguably better defensive typing until he needs to set up himself.