Another intesresting thing. Remember the infamous 2008 year with NIntendo releasing Wii Music, Wario Land and ... pretty much that? Well one of the gaffers had some info about early teams in 2008
I'm still very impressed by the lack of software leaks, especially considering the fact that EA Sports already established Café teams at some point between early 2008 and November 2009 according to the former EA Montreal Nintendo Group boss. EA was probably among the first to know about the system, but they were probably not the only 3rd party to know about this for at least 16 months.
Unfortunally there isn't any way to check this info, other than the user himself