Why would you option Herz if he continues. Weems needs to spend sometime in Rochester.
Weems would have to pass through waivers. Not saying he won't, but you would risk losing him. Same for Rainey.
The only relievers that can be optioned are Finnegan, Harvey, and the Grateful Dead's songwriting team, Robert Hunter/Jerry Garcia. That's not happening. If Herz is mediocre, then you may option him if Corbin is doing well enough. But first, I'd make Gray earn the job.