Definitely going to Zeta Brood Alpha's Leader ability, but I'm trying to decide whether to apply the Omega to his Special attack. The Zeta gives 10% more damage to ally basic attacks (i.e., swarm assists) for each buffed enemy, but his Special would dispel all enemy buffs. Dispel All is always good, but is seems like it might weaken the Swarm effect. Thoughts?
Sun Fac is constantly dispelling buffs from your target anyway, and the swarm attack is already at 50% damage. I don't think the lead zeta is really worth it, if you are having to carefully decide where each zeta goes.
The swarming is great for applying tenacity down, ability block and gaining turn meter on spy and soldier, but really most of the damage is done by spy special and brute attacks anyway.
You are reading too much into the kit ignoring the math. You will do more overall damage from basics. That's it. Do you want to rely more or less on spy's sniping with the team?