User blog comment:DualDragonAce/Support : the underrated game carry - and how they carry/@comment-7996065-20130721193547/@comment-7996065-20130722093532

So one thing we must do as support is to make sure the support you pick WILL sync with whoever ADC is being used (and the rest of the team). If they pick  Ezreal, DO NOT pick  Janna.

I read that as "[the rest of the team / the ADC] pick Ezreal, DO NOT pick Janna".

But yeah I totally understand why you wouldn't pick Janna versus Ezreal.