Why Derek decided to post is beyond me - he seems to still be salty over something that happened over 20 years ago. But I think it's a pretty safe bet that he was paid off for his contributions when they severed ties with him in 1999. If not, then you can be sure there would've been a lawsuit over this which would have been made public at some point before now. Even when they parted, in interviews of that time, Derek wasn't antagonistic - had he been screwed over, it would've come out then, not now.