Of course we have the obvious stupid people....
FTG didn't fail....FTG is instant and Tobirama or Madara's reaction time aren't instant.
Just because you have FTG doesn't mean it benefits you at all...Tobirama reaction time, speed, and reflexes are of no comparison to Madara's or FTG.
FTG (instant) > Madara (speed, reaction time, sensing, reflexes) > Tobirama (speed, reaction time, speed, and reflexes)
#Logic
Neither is Minato's....but his shunshin is also called FTG which is near teleportation level itself.
Minato is called the fastest in general....not by FTG, because unless Kishi doesn't know what speed or instant means then we got FTG all wrong.