Alright... I have been doing a bunch of work with his diet. I went to a feed store and found some Evo and Instinct dry food, which he seems to like. His tastes have increased for wet food, he ate tiki cat, authority, Sheba, meowmix, taste of the wild, and a number of other random ones, but I have figured out his preferences. It does matter the brand, but much more so, he just prefers chicken/turkey and some salmon and tuna, but definitely chicken or turkey. I bought a couple cans of Ziwipeak which I didn't think he would eat because its full of tripe and organ meat, but I mixed a little bit into one he likes, and he did eat it, so tomorrow he'll get more. I haven't tried much raw lately as now I've decided he basically needs to go on a diet, so I've started measuring his food intake (see post on regular nutrition board "timed feedings vs. free feeding") So I'm currently mixing blue, instincts, and Evo all together and giving him less of what he used to get (free feeding). And I do still want to switch him to raw, and I think it'll be easier now that he eats more wet food. If I can get him to eat ziwipeak without having to mix it with anything, THEN I think I'll be able to switch him to raw.
But again, he won't eat plain cooked chicken, raw chicken, raw mice, sardines, ground beef, ground turkey... or basically anything else healthy for him.
Can I give him raw chicken liver? The grocery store has a big container for just over a dollar. But wasn't sure if he's eat them or if they were good.