Fringe, so long as one of the faster six teams beating it don't have a car in contention, that's my point. If the car was a sure thing I'd see plenty of justification to drop Palmer. The fact of the matter is, Hulk hasn't delivered but one time out of 3 decent quali, while Palmer finishes either behind his team mate or a few places off.
The car isn't a stellar performer and it's only fringe because the other Williams is occupied by a rookie worse than Palmer.
Once again if the car actually could reflect what it does on Saturday, I'd find a drop clause in Palmer's contract after this GP and replace him with the Russian. Seems simple, but the problem is you can't say that the car would be doing any better on Sunday (where it actually matters) if someone other than Palmer was in that seat.