Gil has no scruples - Once you know this about the man, it will help you to deal with him at the card table and during the evening at large. While he might say he's playing one way, that means absolutely zero. He'll take the the opportunity that he feels best serves his ranking at the immediate moment - What he said before, even minutes before, will have no bearing on his decision. Summary: Allowing your play to be influenced in any way by what he says will be to your detriment.
To Gil's credit, he's made no bones about having his sights set on the top 5. No bones can be made about his desire at the card table. He has shown he can shoot the moon and you have to be on your toes when receiving a pass from him.
If you can put up with the banter and often inappropriate grandstanding, he can be a solid addition to a foursome.