If healthy all season I would expect Guardado to do the best of that group. Percival would be next and then Looper.
Mota IMO is a risk to keep the job. I'm always wary that a great set-up man doesn't make even a decent closer. I'd still have him next ahead of Takatsu who should be respectable without giving you great K's.
When you're right no one remembers, when you're wrong no one forgets - NZF