Monstrous Companion
Special: This feat counts as the Leadership feat for the purposes of prerequisites. A character cannot have both Leadership and Monstrous Companion.
What happens when you take this feat at level 7, then some class feature gives you the Leadership Feat later on (Nobility Domain for Cleric)?
If you have a generous GM, you could get another feat in place of leadership/Monstrous Mount, possible swapping MM in for the bonus leadership feat.
If your GM is strict, you don't get leadership, period.
Or maybe some kind of middle ground.