I think the final decision needs to be based on would you lose more overall from trading jennings than gain from acquiring hellickson.
The main reason i said yes is because of the versatility you would have if you wanted to grab a solid guy somewhere else.
If you dont plan on making any more trades then i would not make this its very close like everybody else has said.
OF: A. Jackson
UTIL: I. Davis
BN: B. Revere
SP: King Felix, Fiers, Feldman, Minor, Shields, Dickey
RP: Jansen, F. Francisco, Clippard, Cishek, Holland