The kid is 24. I think he could still work out. He has 8 blown saves, tied for 2nd highest in the league. Until last night, he had he same number as Rivera and Paplebon. I do think next year will be a make or break year for him, and he has to work on his endurance so he holds up over a long season.
In terms of command and accuracy, its all subjective. He has not walked many guys, but yes, he can miss up in the zone. But that is not uncommon for young relief pitchers. He has nice stuff as seen by a basically 7:2 K:BB ratio. He is not ELITE, but I think he could be reliable. I think his likely 40 saves to end the year will earn him another shot next year.