I makes more sense for me. Garuda is the fast and weak one, Ifrit is the slow and strong one, Titan should be the middle ground in both mobility and damage. You still would be able to use Mountain Buster (athought you woulnd't be able to double weave a Radiant Aegis) and it would be an opportunity to slidecast more, which is something that this job lacks (complexity in mobility). It would make it more interesting in my opinion.