From memory, AFAIK, the Zig map has 3 spawn points for hostage/ally/battle - all 3 are in the end cells.
Starting a mission with an ally at your side is one of the options that MA could really do with IMO.
If the story dictates that you're entering a mission with help, or meeting at the mission it's clumsy to have to search about in the mission for the ally who's been captured.
On the zig breakout map, is it possible to either: start the mission on the inside, as you do in the tutorial, or get your ally to spawn outside? I have toyed with placement and it always seems to put my ally in a cell, which is great, but I want to start inside with him.