<p>You just gave Gaara the desert, he automatically gets so much more options to win with that. Itachi may be able to win 6 out of 10 battles, but in Gaaras case with the desert I give Gaara 6 out of 10 battles. </p>

<p>Gaara can't win if Itachi's arsenal is completely unrestricted. </p><p>Gaara can summon the whole desert on him if he wants, none of that is harming Itachi through Yata. </p><p>Based on the hype, The totsuka blade lacks a physical form/ethereal. It should be able to penetrate through gaara's sand shield, and gaara isn't dodging it either when it does penetrate. </p><p>Gaara would reduce the chance of any eye contact to as close to zero as he can, which means he is using his full sand sphere, and would try to make an eye that can watch Itachi from where he thinks Itachi won't be able to find it. But it doesn't matter, because Itachi doesn't need any genjutsu to defeat him. </p>