Cats require a high-protein diet naturally as they are more carnivorous than canines, HOWEVER, meat alone is not a complete diet. Cats require vitamins and minerals to make their foods 'complete', just like a person's diet. For example, cats sometimes require cranberry (most good foods have this in them) which helps maintain a healthy urinary tract.
The wet food, as long as it has all of the vitamins and minerals listed in the ingredients will make it complete (I'd have to see the label to tell you; I know the Wellness wet foods are complete).
Plain meat and wet food every day doesn't work; if you give your cat plain meat, he'll consume that and eat less of the canned and recieve less of the nutrients from the wet food, therefore you would only occasionally add meat into his daily diet (say once or twice a week). The reason for my saying this is that meat, due to its protein, is filling; you don't want your cat to fill up on meat alone and not consume enough of the wet food, which has all of his daily requirements in it. Keep in mind that on a day you feed wet food and real meat, you'll need to feed less of the wet food to compensate for the presence of the meat, otherwise if your cat is a bottomless pit that will eat non-stop, he'll gain weight.
Hope this helps; if not, feel free to send me a message.
-Emma
