I'll repeat what I said about DeNiro on the other Sly thread:
I like Bobby Deniro as much as anybody, great actor, but he's no Robert Sylvester. Sly isn't remotely Italian.... he's straight from the American heartland, a good ole boy who grew up playing baseball in the cornfields of Illinois, listening to St. Louis Cardinal games with his old man, just as he did with his sons later in life on their front porch on warm summer nights. He loved hunting with bow and arrow, working on his pickup trucks, canoeing with his lovely daughters, and going on float trips on the Meramec River. And of course, he loved his day job for a decade of training bouncers at the Roughneck Saloon, Roadhouse style.
DeNiro enjoys a fine Chianti with chicken saltimbocca, while Sly eats his fried chicken and mashed potatos and gravy and chases it with a 6-pack of Bud.
Sorry, DeNiro is just too far a stretch to do justice to Bobby Sly in a hollywood epic.