Those are all investigative, but they are different roles. I've never played a Fuji set-up before, but is he known for things like putting two trackers or two watchers in the same game?
My only reservation is it would be an incredibly senseless and amateur move for Worst to fake claim Tracker when he's going to be expected to put up results for it the remainder of the game and can be counter-claimed by the real tracker in the thread. The double claim feels too suspect to overlook though and now I have my eye on Worst.