They all have the same phone number too.

This could be explained away by them working for the same place and assuming to contact them you call the same switchboard and ask for the person, but even back in the 90s it would have been strange for wall street "Vice Presidents" (even if it was somewhat of a ceremonial title) to not have their own unique business number.

Also, Paul Allen giving his card to someone else with the same contact number for the purposes of being in touch to plan to play squash doesn't make much sense unless you get meta and assume Paul Allen was aware this had no practical value and just wanted to ego-drop the card.