I'd just like to make it clear that I'm not downplaying Minato here at all.
Minato probably had a seal on Kakashi but my main point is that he used FTG and not Shunshin here:
First of all, I'd like to point out that there are no streak lines to indicate movement here:
He simply just appeared to where Kakashi was whereas when the Hokage used Shunshin to get to the battlefield their stance was completely different to Minato's in 655 and their stance indicated they used foot speed. They also had streak lines.
This is gonna sound a little weird but it still supports my claim; whenever someone uses Shunshin or foot speed the same black/white lines appear:
Now, whenever Minato uses FTG, different black/white lines appear:
It also doesn't make sense for anyone who isn't Juubito to cover such a massive distance instantly.
Minato probably had a seal on Kakashi but my main point is that he used FTG and not Shunshin here:
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This is gonna sound a little weird but it still supports my claim; whenever someone uses Shunshin or foot speed the same black/white lines appear:
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Now, whenever Minato uses FTG, different black/white lines appear:
Uses FTG to send the Juubidama to the ocean
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And finally in chapter 655, bottom left-hand panel
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It also doesn't make sense for anyone who isn't Juubito to cover such a massive distance instantly.