I wasn't going to say anything, and I still probably shouldn't but here it goes...
Most of us here have multi-cat households. I think very few people on this forum have just one. So it's difficult to be judgmental of someone wanting a second cat. I'm pretty committed to keeping 2-3 perpetually I think. And there is something to be said for planning for it, doing it, and making it work. I've never had kids, so I can't necessarily empathize with that particular variable, but aside from that factor, if I were in your shoes, I honestly can't say I wouldn't get another cat (sorry, double or triple negatives there
)
I guess the thing that strikes me though is all the "pinball action". First it's "we need to rehome down to one", then it's "we need to add an EG cat", then it's "we need a young kitten that is well socialized", then it's "no, one cat is optimal, I'd never do that again to BB", then it's "we need to adopt some older kitten because she needs a home". And this is all in the span of a couple of months. So yea, it just seems like a daily whipsaw of out-of-control emotion and impulse.
I personally won't criticize you if you decide to get a second cat (as long as it doesn't result in rehoming BB, if that were to happen then prepare for Armageddon
), but please at least do it rationally and don't do it on impulse. I think you need to always keep the Jasper experience in the forefront of your mind, learn from that, and if you do get a second get, at least give yourself the very best chance of success.