I get that Gaara Is really strong now, and he has improved intellect and skill to his prior self. However Im pretty sure Minato even without his speed is more then a match for him.
Gaaras sand is rendered useless when Minato summons gama to spew oil everywhere. At that point sand is to weak to stop Minatos rasengan (if lets say it werent strong enough to already take down the sand defense as is.) You guys seem to also disregard the fact that in many battles, both sides take significant damage, so who is to say that after the first hit Minato does manage to make on Gaara, that he wont plant a seal?
Minato was also able to teleport the nine tails attack. So why wouldnt he be able to teleport a large amount of sand attacks as well?
As for Gaaras flying, I dont know how many of you have played Ninja storm two but, Kunai to the sky and warp anyone? if not that he could just throw one, warp to it and throw another to keep going higher in the sky. (as if Gamas legs arent enough to close the gap as is.)
Now regarding strategy and tactician moves, Im pretty sure Minato was a esteemed genius on the battlefield.
But lets put it on terms even the biggest of trolls cant argue against.
Tobi > Gaara but yet Minato > Tobi ? So in this equation we can rule out Gaara beating Minato.