Borrow a Hero

I realize this is not a high priority topic, but I did a search on this, and there's lots of speculation, but didn't see any concrete answers. Any chance a dev can give a real answer on:
1) How are offered allies chosen? - meaning I have max allies, but always get the same few allies almost every time, and many many allies that I have never seen.
2) How is the hero offered chosen? - is it last leader played? Rng? Always Barris and Sid?
3) Is there a cool down on re-using an ally?
Thanks!

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