I'm seeing wandering Champion ships belonging to both AIs.
There's also the respawns-when-killed nemesis units the AI gets in response to you having champions: there's only one of those (per human champion) in the game at any one time though. So they shouldn't be respawning particularly quickly (it checks them about once a minute) unless you're really throwing them in the chipper shredder somehow.
The ones from the dirty-tricks bank can keep piling up, though.
I'd forgotten about the respawning Nemesis. Are the those units on a per-AI basis, joint-AI (random), or first-AI? If I've got the patch notes correct, I should expect 5 respawning AI Champions:
(8 human Champions * 1 (frigate) * (9.0/7) * (1/2) = 5.14 rounds to 5.
I'm seeing much larger groups from AI 1, but I've seen groups of Nemesis of that size from AI 2 at the same time.
Yup, just checked my save at exactly hour 1, and each AI spawns 5 Nemesis that are threatfleet (1 each AI each minute).
I guess that explains it.
8 human Champions + Diff 9 = 5 Frigates per hull size, per AI.
5 for Frigates
10 for Destroyers
15 for Cruisers
20 for Battleships
that respawn 1 per minute as fast as you kill them.
In addition, AI 1 gets 1 per 3 minutes per Hull Size from Dirty Tricks (1 per 3 mins, 2 per 3 mins, 1 per minute, 4 per 3 mins).
In addition, a Heroic AI gets 7 per 20 minutes (of hull size = tech level), plus 2 with each wave.
In addition, there are the Defensive fleets.
That's... a lot of Nemesis.