I am very glad to hear this, congrats to you and Norman! I've been working with a sick but very loved cat as well, she's doing better with every passing day and worth every penny I've spent on her. FWIW, I think you made the right choice.
When does Norman come home?
[I fed the Science Diet dry formula to deal with Wilbur's tendency to plug for years--BUT that food is what precipitated Pyewackett's diabetes!.
Cat people, dump the dry food! Your vet may not even know about this more recent work! It isn't about one company against another--the same companies make dry and canned. It's about % calories from carbohydrates. You are risking Kitty by feeding them a relatively high carbohydrate diet.
Corn is for HOGS and CHICKENS, not Kitty. They'll eat carbohydrates--with relish, we'll all seen cats break into wrapped loaves of bread, cookies, etc.--but that doesn't prove that is what they should be eating, because they will also lap up antifreeze causes them an agonizing death.
Feed low % calories from carbohydrate canned food, be it ever so inconvenient, and avoid diabetes and urinary tract hell.]