idk if this was clarified or not, from what i read it wasn't, but if it was i'm sorry.... the lawyers don't negotiate pub splits, the artist/management negotiate with the producer/management to reach a "fair" agreement. in a normal situation, its usually 50/50 artist producer, if the artist shares writing credits and isn't the sole writer, they then split they 50 percent with those other writer(s) however they negotiate it to be split. in a situation like this, i almost think it was generous of wayne to give this producer 35% because he probably could have given him 25% and the dude would have been happy about it, knowing it was for waynes album and the ascaap/bmi checks he'd be getting quarterly would be pretty fat.
this is what called a 'split', artists are told to make 'split sheets' for every song they make, not just album songs, just in case the song is ever released so there is no problem. it can work the opposite way, say you're a nobody rapper and somehow get dr. dre to give you a beat he knows you're gonna use it for your album, he tells you if you want it the split has to be 75/25 in his favor, and you really have no choice, so you do it and are pissed off about it later, but it happens all the time.
some producers take an upfront free in addition to their pub split. if this happens the producer usually takes a lower % than they normall would have taken, because they believe that either the song or the album will not do well and that the upfront money is a more sound way of doing business for that particular instance.
the guy suing them should be suing all of them, universal, ymcmb, wayne, the produers, all of them. they are all responsible for the use of the song, not just the producer who gave the song away. universal/ymcmb, as usual, didn't do their due dilligence to figure out who if anybody else owned parts of or the whole song, and it comes back to bite them.
in regards to a milli, from what i understand, bangladesh let that go because the producer who submitted it to him, told him it was sample free, after bangladesh added whatever sounds to it that he did so he could take a producer credit (the dr dre method of producing), he then told wayne & co. that it was sample free. in reality the "a milli a milli a milli" is sampled from an old tribe called quest b-side remix, which i can't remember off top, and they all got sued over it, and bangladesh felt stupid