Yeah, I would like to see him back. They need to sign at least one other half-way decent relief pitcher. Will they do it???? This front office has shown that they don't like to spend resources on the bullpen.
I think a decent comp would actually be a former Twins pitcher currently being profiled on this website, Trevor May. May's numbers coming off his age 30 season were very similar to Fullmer's. May got a two year deal for a little over $15 million from the Mets. With inflation, it's possible Fullmer could get more, although you could also argue the Mets overpaid. If I were the GM I would be willing to do 2 years at $15 million, but probably no more.