Show me a scan. I am sure it said "better" not "faster". Better =/= faster. And it was referring to shunshin. When Tobirama saved KCM from the TBB, fighting Juubito with minimal success like Minato was, etc. How were they not portrayed equals?
1- The very scan the Minato arraived first is proof by itself that he's faster, otherwise they would have arrived at the same time.(=
2- I said that before, and I'll say it again, FTG is often called a shunshin.
Examples.
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- Minato was going to teleport that anyway, and just because Tobirama did it, that by no means make him on the same level as KCM Minato!
As for your question
How were they not portrayed equals?
1- If you look at their hype from statements and stuff, Tobirama falls short before Minato.
Like, with A, Kakashi, Jiraiya's statements....etc. However, you don't see the same things with Tobirama.
2- Their feats.
Minato finished the 3rd War. he fought A & B who were said to be the strongest tag team on Kumo, unlike Tobirama who was defeated by a weaker team (kin & gin). Minato also defeated obito and sealed Kurama.
3- Kishi always as well compare Naruto to his father.
As for Tobirama, when they first arrived he said Minato is better than him. He also said he can't teleport everyone like Minato...etc
even if we start to compare their jutsus, Minato is still superior to Tobirama in base.