According to Simon Jordan (ex Palace owner/chairman) Yannick Bolasie's £28m was worth £9m to bristol city. Of course he might have plucked a number out of thin air but he was on radio 5 just now (12:55pm ish and quoted that as an example of third party ownership).
There was a sizeable sell on percentage for Angers over Kodjia, even if the total fee reaches £15m we won't get anywhere near that.
Sure that Steve Lansdown said after the Kodjia and Adomah sales we were about £4m up on transfers over the summer and that the Bolasie clause was pretty near that amount.