if I was him I would have at least kept training arms... they do look bad ass.
and I don't think large arms would hurt his acting career...
the thing is, Kevin had a different mindset
he would either do something 100% or not even bother doing it
bodybuilding was his career, not his life style
he trained heavy, ate like 500 bucks worth of food a week
and dedicated 4 months to getting ready for a show
he's retired now, I know many guys like Dorian, Nasser, Serge Nubret, still train
but he is into his acting career now, I bet he could get in the gym for 6 months
and build a body better than 99% of the population naturally