If you look carefully at this pic:yes it is a given knowledge he can teleport to point A to B without throwin the kunai. However, it was shown that the raikage was close to minato speed without onoki help. Thus, you have to consider that together they might be able to take down minato. I even used might to not make u too upset XD
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You can see that Minato intentionally waited the last moment to teleport himself. You will probably ask me why? Just look top of the pic and look where his kunai of FTG is. It's near Raikages knees. Then look at the left at the end of the pic. The kunai of FTG is near his shoulders, and Kishimoto even wanted us to notice that. That's why he made that pic. What i mean? It's that when Raikage was near him, Minato had time to throw his kunai near Raikages shoulder even without he noticed it, and came after that to finish him, but Bee intervened at that moment.
That pic shows that Minato was clearly much more faster than him to react. So even with Onokis help, yes he is sure faster, but Minato still has the edge cuz he has better reflexes or reactions than the Raikage and he can teleport himself everywhere his kunais are, which can be make in an instant.:scorps: