I'm not sure on the Onyeka fee, i think i did read about £8 million. The other 2 are a touch out though, more so the Wright one.
I can't see anything for Wright that has add ons as anything more than £2 million, which would take him to a max of £9.7 million.
For Simms, everything i've found suggests £8 million is the absolute tops. Promotion will be one of them, no idea if he's hit everything to make up the maximum amount.
I don't think King would get into open ended agreements of that kind, he's a very shrewd negotiator. I've got a feeling he said within two years at one point but I don't remember. Haji for example is signed through 2027 with an option on top and the fee was reported to be £7.7m.
Coventry City contract news from CoventryLive as reports in the Turkish press reveal the finer details of Haji Wright's transfer, including promotion bonuses and a hefty sell-on clause