Zergs are individuals too... even if somewhat limited intellectually
. Well as far as the lore I've read is correct, I missed some of the SC2 part. Much like the bugs in ender's game, from what I recall from the later books in the series. I agree that the "hivemind" part does not fit neinzuls.
About neinzuls the part where they're all born for 24 hours (or rather 5 seconds when I use them to crush an AI's defenses) with all of their ancestors memory I don't see fitting. In enclave, ok, why not. In individual neinzuls ? Ok, it sounds cool, but neinzuls reproduce like crazy, very fast and in huge number, and somehow in them they have some kind of mental brain capable of storing their history, weapons, engines and all ? And are capable of "building" that with no remorse nor any "engineering" issues doing those fast and in huge numbers ? And, somehow, they've got some kind of link that can transfer memories ?
I'm all for blue & orange mentality, and aliens which are really alien, and / or have fantastic capabilities, but I don't see that possible unless magic's involved. To me, it's too far-fetched. I'd be ok with the enclave building the yougling's "memory" and its brain so it can function & think, but that's about it.
That said. Only an opinion.
PS: kind of the point why I asked for precisions in the neinzul lore a few pages back =). It changes a lot what the race should play as.