Thank you all, we are home!
I had a huge chat to the vet. His eye is a bit better but he is on Clavubactin 500mg twice a day. The Cytology didn't really show much at all. He said if this was caused by some infection from either his elbow drains or when he had the nasty infection from KC, that he would have been a VERY sick puppy. He said it is unusual but that sometimes it is just some bacteria from the gut that gets into the bloodstream.
So basically I have to keep watching him and see how he goes. If he needs to go back it will be much more invasive. Eg: Remove one of the back molars whose roots go into the back of the eye, so that would be another drainage point.
He showed me photos and description from a textbook and I am so glad we caught this early.
The good news is porky puppy had two breakfasts! The vet fed him and then the nurse didn't realise so gave him round 2!!!
He squealed twice when he fully opened his mouth when he saw me.
Fingers crossed the abx knocks whatever this is on the head and fast.
Oh he also said that it would be advisable to have Coop on abx before his surgery.
Thank you all for your support, I so need it.