I saw Frank at the DIADL tour stop in San Fran six years ago. He was there before the show and we took pics and talked. Turns out, he lives out here now, and his job keeps him really busy. He guested that night during the encore (Still Remains). From what I understand, he's always welcome to take part in things. But his time is limited. I think he's still in the music industry, but on the business side. But I could be wrong.
We had a laugh because before he moved out to Cali, he lived in the town on Long Island where I was born. So I joked with him how he really needs to stop stalking me. Going coast-to-coast is a little too much. He was laughing pretty hard. Hell of a nice guy. And one incredible guitarist.