Except that you start as an escortee and ally is more that capable of defending itself and actually fighting back alongside with you, you can call it that way. Just an idea.
They would just get wrecked by the enemy AI's ability to magically paradrop 500 siege cadres into your base every 3 seconds
Opposite is also true. At start of a mission AI ally could be perfectly able to hold its ground and attack without you, then something happens and you have to work together, then something else happens and now you have to help your ally to survive. With ally trying its best to help all the time.
I'm aware that MO already has coop and all, but i'd really like to see some missions in singleplayer where you have an AI ally. And not like those in ACT 1 where, while helpful, they are very limited in numbers (Allied Zero Signal comes to mind). It would be great to actually have a full fledged AI with a base helping you out. Is there any chance this will happen?
I'm pretty sure that Foehn headgear also serves as anti-mind control device. Its not effective (probably) against direct MC attacks, but against mass MC influences it does its job. At least from story point of view. I could be wrong, of course, but it seems logical.