[Joseph Jostar]

Unfortunately it has some logistics issues, namely that just because the Tactician can move, it doesn't mean the rest of the people in formations have a valid path to the next location they would be at. Not to say it's a bad idea, or anything.

Seems like a good place to tie in to the tactical part, Tactician can choose movement as normal with allies matching his every step and if he moves poorly (over ice tiles, allies hitting obstacles) the formation gets broken as a result, and might even block his own movement.

Just have them match him step for step and ignore invalid movements? Granted, checking validity when allies are moving into the tiles eachother occupied a moment ago could be a little tricky, but it's a very neat idea.