All my guys lost weight with the addition of kittens from the extra activity of running around with them. In your case, Ashley's running AWAY from him!
If you're really concerned, another active kitten of the same general age is the best solution. I never ever would have gotten a single kitten by himself because I know how much they can terrorize the adult cats in the home (well I did with Pouncer and learned about kittens with fostering).
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