SRL for [instrumental]: If Giffords is unable to recover fully before the next election , I think it would make sense that her second - in - command , or whomever has been most [instrumental] in the work that her office has been doing since the injury , goes ahead and runs in her place .
ARG-0: whomever | ARG-M-EXT: most | ARG-1: in the work that her office has been doing since the injury