I hate seeing threads like these but I also love it because I love to see Minato Fan Boys in pain, your not made because Tobirama also has FTG, your made because Minato didn't come in and SOLO Juubito like you all thought he would.
Tobirama being able to use FTG does not take away from Minato in the slightest, what was he biggest feat the fact that he created FTG? Because if that was the biggest feat he has then I think his prestige should be recalculated. But if him "inventing" FTG wasn't a huge feat then it makes no difference if someone else created it first. Besides Tobirama himself already said that Minato's FTG is better than his meaning that Minato took his technique and improved it.
Lastly Tobirama is a genius, he created Edo, He created the Paperbomb summoning explosion technique, he created FTG, he no doubt created Eternal Darkness Genjutsu, and that is just what we know of so far. The guy was the driving force behind the creation of Konoha too being the one who implemented many of their systems like the police and the academy etc... Hasihrama was a genius when it comes to raw power but Tobirama was a genius in a different sense and I think that should be respected.
Lastly, Tobirama being able to use FTG doesn't neccesarily make him fast, Minato being so fast was why he was so deadly with it, for example there is the time during the war where Konoha was drastically outnumbered and minato had them all throw his special kunie's into the opposing army and then in an instance took nearly the entire army out, so fast that it looked like he was in more than 1 place at a time. Yes, FTG allows you to teleport from one place to another, but it takes speed of Minato's level to make it truly shine, and I don't believe Tobirama has that.
So cheer up fanboy, Minato is still as strong as ever, he is just a little more balanced...