Pride fights that didn't happen?!

I'm watching early Pride events, so many great match ups but I have to imagine that there were some great fights that didn't happen due to injury or other issues? I'll start with the first one I remember

Igor Vovchanchin vs Ken Shamrock...Ken got injured and Tre Telligman stepped in and surprised everyone by beating Vov by decision..

So let's hear the rest

Mark Kerr vs Royce Gracie..I forget why it didn't happen..

Btw Ruas always wanted to fight Rickson but of course it didn't happen..also, Ruas wanted to fight Tom Erickson but the big cat declined I believe due to not enough time to train..I'd love to know the details behind that one