Some say that 14 SV, 4 BS with a 78 %SV after 3 yrs makes him a successful closer. Furthermore, I'm not sure if these numbers can label you as closer.
Anyways, He is our only option at this point, now that the other two busts are on DL. He has showed good things, but still he would be another experiment as closer. Hopefully he becomes the closer we have been looking for.