Actually, it's a moot point.  AMEX Zync may not be allowing additional card members now.  I just checked their site to be certain, and got a message that they were not accepting additional memberships and to call the number on the back of the card for any questions. 

In The Garden 02/01/13
TU(TU04)=813 EQ(BEACON 9.0)=803 EX=756(4/2013) CL=$123,650 TOTAL/UTIL= ~5%