Not likely Baylor, but Oklahoma St, Texas Tech, TCU and one other.
I don't think it ends up happening, but it's within the realm of possibility and something to be aware of.
Unfortunately saying so is generally going to get someone downvoted and dismissed more than any real discussion. But it's a possibility on the table.
I still think the most likely is the Big 12 adding from the PAC12. But there's a non-neglible chance that neither takes from the other or that the PAC takes from the Big 12 instead