Simultaneously is the question.. Reason I ask- I have 5 nights comped at the Rio in September and currently Platinum.(Only because of the TR credit card bonus) My buddy on this annual trip is Diamond already for next year from AC and no real need to earn tier credits this trip (Other than some play on his one comped night). Would like to show CET enough action to justify the extra night on my comps and a $85 Saturday that I have never gotten before. So if we both play on my card (At the same time) will they figure it out in the long run? Thanks for any replies!