I don't see any reason whatsoever to take JFG out for Watson at this point.
Watson is still a better player than JFG. Moore and Watson will be big upgrades to the receiving core once they are both healthy. Kohlert is also a steady NI receiver, but if anyone may be relegated to the 3rd NI receiver it would be him IMO. I know I'm going to take flack because Kohlert is essentially the new Stoddard (actually, more skilled than Stoddard), but all of our receivers catch the ball extremely well.