Mats can cause a cat pain, particularly if they are pulling and next to the skin. This would be enough for your cat to stop grooming.
You should also trim his fur away at least 1 in. in diameter from around his anus. Blunt-nose moustache scissors or bandage scissors do a good job. This will prevent poop getting tangled in his breeches.
Any good canned food is better than dry kibble. He will have better coat condition on canned food, such as "Wellness" brand, or a better quality no-grain kibble (no corn, rice beet pulp, wheat, soy), such as Evo, and likely better energy as well. They will cost a little more, but you will find you'll actually feed less to maintain a proper weight.
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"We humans are indeed fortunate if we happen to be chosen to be owned by a cat." -- Anonymous
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