My old Harvey that I had many years ago had this same surgery. He also was semi-wild and would not let anyone hold him, but was loving in his way. Strangely, he is also the cat that let new kitten Eddie "suckle" on him for many years! So he had a sweetness about him, but just did not like to be approached, held or petted very much.
I am enjoying meeting your cats one at a time! You are a terrific cat mom to have the patience you do! Each and every cat is so special and I am glad certain people have the ability to see the uniqueness of every cat like you do ....now will wait for #5