I bet Billy wasn't surprised. He came into popularity in the 70s, where the label was king and legal matters and executive orders ruled the day (if the band wanted to be rich anyway). Even in the 80s when the labels became weaker due to the growing independent labels, bands from the 70s, like Tony Iommi would, still let the labels push them around because they still had that mentality.
Anyway, I'll pick a side. That woman has essentially ruined the career of all those men for the last 10 years artistically, but they have all become very wealthy because of it. Bill has earned a large income from all the rereleases, box sets and comeback tours up til this point, and will continue to make a strong living on royalties, and this new album is going to be shit. Maybe it's better he is not a part of it, just as it is good that Bon Scott never has to have his name on all those deals with Wal-Mart that AC/DC makes nowadays, making him the only member who is NOT on a Highway to Hell.