Kunai throws while running and near instant mokuton pop while running easily disrupts the Kamui charge. Then he puts the cover on himself, wood clones.. and gg.
There is no "kamui snipe from start".
You forgot to add logic to this post. Kakashi can set up Kamui even faster than Susano arrows, which are way faster than kunais. Hashirama wont be on time to throw the kunai. Please stop posting nonsense.
EDIT: Nice try, at least you made me laugh with the "kamui charge" thing. Lmao. Kamui and charge can't go togheter in the same sentence. Even Obito with Rinnengan and Sharingan couldn't see it happening. It even worked faster than the summoning jutsu (which is a S/T jutsu) against the gedo Mazo.
And even if the kunai is thrown, Kakashi dodges it easely while using Kamui, he already showed he can use Kamui while moving at a high speed like he showed against Kaguya.