Yes you have a point although on past performances and if both reserves were fully fit you would expect Blodorn to get 5 rides as he did the last time Sheffield were in town. Jye is pretty awful at Sheffield so a guest won't do Belle Vue any harm.
Blodorn is a far better rider than Jye though so given the opportunity why not take him out. If Jye was dizzy, that would indicate mild concussion so he shouldn't ride Thursday either and any guest is probably better than Jye at Sheffield!
It's finely balanced, Aces should have won more easily, Lemon tactically taking Etheridge out backfired in my view. Blodorn didn't do what was expected 6 from 7rides is poor for him.
IYes Holder was still turning but I thought he didn't move off his line and the gap was big enough to get through, I thought Wright tried to close the gap and hit Holder in the process as he was almost past him at the moment of the collision. When Sedgmen got passed by Kurtz there would have been a collision too had Sedgmen not backed off.