Without seeing your roster or knowing any info about your league I'd say hold on to him for now. He's closing now (although who knows for how long) but as long as he's the incumbent hold onto him.
If you can drop someone off your bench to pick up Fukijima that's ideal and what I would do.
Help me out if you can.viewtopic.php?t=457528
12-team 5x5 H2H w/4 keepers