Allies heroes

Tzon

How do I know which heroes of mine my allies are using?? I actually wanna know how does the system picks which character to borrow.

Im2awesome

Itll be ur leader , either dark or light side. Depending on the mission ur ally is using

Geddre

Leader in which section though? Is my most recent leader used on dark side missions what they see on dark side missions? Is my most recent leader on GW what they see in GW? Like it's different in each section?

And why am I presented anywhere from 0 to 4 allies at any given time? I have my allies list full. What determines which ones are presented to me?