Did Bobby express regret about MRJ leaving the show? Really? Interesting.
Yes, he did at Comic Con San Diego, 2014. He said he thought it was a real shame to see MRJ leave, because he is a fine actor and was an asset to the show (paraphrase).
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy