T-Mobile sharing My Faves on a Family plan?

Before I signed up for the Family 4-Pack, I had heard rumors the My Faves numbers could be shared across all lines on a Family plan. After talking to two customer service representatives, I got two different answers. The first individual told me I could share My Faves across my 5 lines which would provide me with 25 My Faves numbers, the second told me that calls made on a line are only associated with the 5 numbers registered on that line.

From my limited testing and monitoring of my account on the my.t-mobile.com web set, it looks like the second representative was correct and that the Family 4-Pack does not change how the original My Faves option works. Too bad...

I will have to wait for the end of my billing cycle to completely validate how My Faves works, since the billing system validates all calls when the statements gets generated, but in the past the my.t-mobile.com web site has been pretty accurate.