This kinda reminds me of LaTroy Hawkins and Damaso Marte. Both guys were "stuff" guys who supposedly were back of the 'pen type RPs. Soriano has terrific stuff and might be better suited, make-up wise, to be a set up man at this point in time. Putz has been lights out this year, and with a bit more experience than Soriano, Hargrove has made the right call. The possibility of ruining a guy if he doesn't produce in a pretty significant role seems more likely the reason Hargrove made the call he did.
**DISCLAIMER** I own Putz in a money league....go Putz!