If there isn't a gotcha, this is a slick way for Citi to take a swipe at Chase without undermining their own AAdvantage cards, but they also need to add a Skyteam partner and Aeroplan would have been more useful than SQ I think.

Points can be transferred from one ThankYou account to another which would make it easier to transfer to an airline if the names must match, provided both BAEC members have qualifying ThankYou accounts.