Ummm... I'm not sure which of a few questions you're asking.  It's not needed per say; I just think it makes sense for the control panel UI to appear under the same active link as the "easy admin" page.  Since they are two different apps, I gave them two different blocks that they activate.

I could have made the easyadmin_active page to activate control_panel_active or the other way around (or to have a single shared one), but this seemed to be a more confusing design--with sharing of info that might seem accidental and could easily be broken without knowing it.