Some casinos have the FP already loaded on the players card for a certain date(s).
You access it via a little screen on the machine, enter his card, enter his PIN, etc.
Some may still require a stop at the Players Club to get the FP loaded.
In that case you must present ID to have it loaded.
Probably wouldn't work to present his ID.
Ask first. Don't try it just to see. That might cause problems.
Hitting a hand pay jackpot, it makes no difference, no problem.
They don't even care about the card that is in the machine at the time, or whether there is even a card inserted.
Just hand the attendant your card and your ID.