Those are fair points! The first thing was meant to concern cases where a unit is in the middle of the player's formation so that they can't move anywhere no matter how the opponent changes their formation. I'll add a clarification.
There should already be a statement towards the end of the rules stating that the player may move only one unit on their turn if they have only one non-exhausted unit left; I guess I could add an extra point about it earlier in the rules to make it clearer.