I agreeThe fact that minato can even go in this stage as soon as he revives is impressive.
But since he's been with Kushina for quite some time, who was the jinchurici, and since we asume that what he got is "just" chakra and not the mind of Kurama - I think he had tha basics down, even before he died - and we know he's a fast learner
And if he remembers all he saw through Narutos eyes during the time his chakra was sealed inside him, that would most likely have given him quite a good idea about how to control the chakra
But if he does remember all the stuff from when the chakra was sealed inside Naruto, I think it's a bit strange he asked Sakura if she's Narutos girlfriend (And since I'm all for NaruHina - I didn't like that hehe)