Theoretically they could find ABs for both. Fisher could share DH duties with Gattis, while Gonzalez plays LF. Personally I'd be a little surprised if Fisher doesn't start the year back in Fresno - why not let him try to get his groove back there. His late-season performance sure didn't earn him a starting gig, and it would probably be more beneficial to him to get more regular playing time and hopefully develop a little further.
If they open the season with Reddick/Marisnick/Springer across the OF, Gattis DH'ing, and Stassi/McCann catching, that doesn't sound bad at all to me. But I could see signing someone like CarGo or Logan Morrison or Lucas Duda to DH or play LF, and add another dependable LH bat to the lineup.