I'll mention I'm not *exactly* sure what dark Kurama gives Minato besides more chakra, but my instinct here would be Luffy. Haki means he should be able to anticipate a 'porting in Minato, especially after a few tries.
A rasengan would hurt, but one or two certainly wouldn't drop him. A blade cut ditto. And a big hit from Luffy would do a ton of damage.
So I think Minato would inflict several hits but would get struck eventually and Luffy'd win.
Assuming non-Edo Minato, because Luffy lacks sealing.
Originally posted by BloodRain
Shouldnt Minato have the same Beast powers as Naruto at this point?
No. Naruto trained for a lot of his jutsu. The extendo-hands, the beast ball, the extendohands. We haven't seen Minato doing the full cloak like Kurama and Naruto can do in full partnership.
It gives him more chakra, but he hasn't shown near Naruto's tricks with it.
Originally posted by Luffygear4
does kurama know how to actually fight like that though, wouldnt minato do better with his regular jutsus and taijutsu rather than give an inexperienced fighter the wheel so they can throw around mountain busters?
Mountain busters are mountain busters- especially when protected by the chakra of Kurama's form at the time too.