I TOLD YOU if he could fly people would use this as an argument.
This is a reason why I thought Loki would be a Dragon, Flame Clouds removes any "can't sail" problems with him.
Loki will play both sides, then command the Galleila once they're free via Kuzan and possibly York (she could help with the unfreezing with SCIENCE). I think Loki playing both sides is kinda foreshadowed by him offering to destroy a random pirate crew for Luffy.
Loki is an opportunist, like Rocks/Buggy/Teach: he'll work WITH nearly anyone to get his goals, but won't work UNDER anyone.
If we go back to Wano, and Yamato, Carrot, and Tama join the Crew, but Loki doesn't, the fan reactions are going to be wild.