Actually I met him just Saturday at Horrorfind Weekend! He was cool, seemed a bit tired. I got him to sign a pic from Aliens with Hicks and Vasquez.
I asked him about Tombstone because I'd read an interview with kurt russell where russell said there was tons of unused footage sitting in his garage, that the movie was meant to be like the Godfather of westerns but got cut down. Anyway I asked Biehn about that and he said it's true there was lots of unused footage but it was mostly unusable. They'd shot most of the movie with one director(Kevin Jarre) but he was fired and the movie rewritten and reshot, by George Cosmatos. He said the footage unused was mostly for the previous version and we'd probably never see it released.
I'd vote Hicks btw.