Given that all the major powers had expended what force they had attacking Kerrigan only to end up either being totally smashed entirely (UED) or to go back to the safety and comfort of their ruined homeworlds, I'd say Kerrigan would have had plenty of time to chase down any errant cerebrates afterwards. It's not as if Kerrigan would've wanted to let all her hard-work getting that power in the first place being potentially undone. Besides, she wouldn't have had anything to do from then on except maybe sit around doing nothing for 4 years. Oh yeah, that's what she actually ended up doing anyway... Silly me!
But that's exactly what the Broodmothers are (or maybe supposed to be?). As to the matter of them being interesting, well, it's probably because Blizz didn't really do that much to make them anymore interesting or conceptually any different than what the initial cerebrates were. When we first see them in Sc2, they're already just there fulfilling the cerebrate role like they did before and everything was hunky-dory. Only in HotS do we get a possibility of a rebellious Broodmother but it's short-lived and it turns out their pretty easily swayed to go back on Kerrigan's side, so go figure.
Course, this doesn't mean it would stop you from writing an alternate sequel about the trouble Kerrigan had making and controlling the first Broodmother and how it ended up being her downfall. It'd be a nice riff on that "you're your own worst enemy" theme, give you some Zerg-on-Zerg and a way to bring them back to their roots.
To be fair, the weakening of Mengsk happened in BW - he kind of lost his mojo there and stopped feeling like a threat anyone could take seriously. If anything, Sc2/WoL bumped him up a bit more as a possible physical threat even though that type of threat, in practice, still retained that ineffectual, "toothless tiger" feel we initially got from BW. This is partially why it's so unsatisfactory to have him be the villain across 2 entries of Sc2.
The weakening of the Overmind is just shameful because it's not just at it's expense to prop up some other dude, it also had the double-effect of gutting what the Zerg were all about in the first place. Hence, the need to introduce the Primal Zerg to prop them back up. But, the problem with the Primal Zerg is the same as it is with Amon - it's the assumption that they were always supposed be like that. They're essentially saying the Zerg are not the Zerg by undermining and re-imagining wholesale the initial concept of the Zerg altogether.
As to Duran and Narud, they're threat level is really attributed and tied into the Hybrids and Amon. Given the indifference I already show toward the uninspired threat that is Amon, I shouldn't be expected to really care much more about his underlings either, honestly. Sure, Duran/Narud (could be two different people) may have a different agenda and be genuine threats on their own, but given there's been so little exploration of either and what they will reveal will still come off as a tomato surprise, I'd still wouldn't expect any interesting villainy to come from them in the end.





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No, Aldaris' end was the exact result of his personality -- he briefly grants the Dark Templar some credit after the fall of Aiur, but completely overreacts when he finds out about Raszagal. It makes sense for someone who was reluctant to trust the DT (or anyone in general) to act this way. His motives are obvious. That is, it's easy to see why Aldaris didn't make the smartest choices ever.
(I had to gag for a moment there)

