Walters, you might remember, was a Blue Jay for a little bit in 2011, pitching 1 inning in 1 game. Last year he made 8 starts for the Twins, with a 5.95 ERA, 39.1 innings, 51 hits, 18 walk and 22 strikeouts, He signed with the Royals as a free agent in the off-season. He's been pitching at Omaha, the Royals Triple-A team. In 10 games, 8 starts, he has a 7.97 ERA, 40.2 innings 52 hits, 19 walks and 34 strikeouts. I imagine he's minor league depth. He's right-handed and 29 years old.
Melky Mesa was in the Yankees system and played 5 games for the Yankees last year, he signed with the Royals in the off-season and has been playing in Omaha too. He has a .284/.346/.527 slash line in 23 games. He's 27, a right-handed hitter. I imagine he'll be in Buffalo, at least for a bit. He's played all 3 outfield spots.
I think they will be roster fillers at Buffalo.