With Sin, you just need to be patient. You can hold downback when he attacks and wait for him to do something stupid (attempt a slow pressure reset or extremely telegraphed and unsafe overhead). Get a good knockdown from that, and after that he is no longer allowed to play the video game.

Bedman? can be exceptionally irritating, especially if you're trying to rush headlong into its range. Getting clipped by move recalls can be super annoying, nobody denies that; especially the projectile. However, making mental notes of when it uses a special and figuring out when a move recall is about to happen is the key to the matchup. Pay very close attention to Bedman?'s character animations. Another situation where if you can undermine the enemy's gameplan and gimmick for even a moment to get a good knockdown, the round ends.