-_-
Exactly, shunshin is instant, notice how when sasuke use's shunshin it's instant, notice how when jiriyah moves with sage mode, it's instant.
Shunshin is SUPPOSED to be DAMN FAST(and btw teleportation is technically just fast movement as stated in the manga

)
You are twisting the manga to create proofs which cannot be seen, you are merely holding on to a rumour. If it is mentioned for the first time and explained I will like it because then kishi will have done a better job then you. though I don't think it will be.
Learn to read...
for 1) yes minato is better at it then sasuke
and 2) I never said he went half a mile in an instant with pure speed, learn to read.