So for simplicity, let's just consider Rebels: Number Crunch gives R2 10% max health for each Rebel ally. And with a zeta, R2 gives each Rebel ally 10% of his max health.
What order does this happen in? Assuming R2 himself counts as an ally (does he?), he then gets an extra 50% health. Does he only give out 10% of his original base, or does he give out 10% of this boosted health (which I guess is 15% of his base)? And does he count again as a Rebel ally himself for the zeta, giving himself another 10%? (Meaning he could end up with 160% or 165% of his original base.)
Disclaimer: math isn't my strong suit, so I could very well have that wrong.
[If this belongs in character and arena strategy, please feel free to move this.]