One big factor is his down special, the tail stab. Right now, no one knows how to use it. Sakurai acknowledged in a recent official interview with Nintendo that it's not a very good 1v1 move, but in matches with more players, it's easier to catch people. But once people get in training mode and start testing stuff out, there might be some setups or combos that can reliably distance Ridley from the opponent and make the move connect. Can't imagine it'll be easy, but if it can be done, then that might make a big difference.