Executioner's Blade, Shira's Blade and Samehada are all in hugely different weight classes than what Omoi used.

"But saying Zabuza and Kisame could do it so you can't" isn't even an applicable use of my statement. With conditioning, carrying around 2-15lb is realistic. U.S. soldiers are conditioned to carry around 40lb. extra on their backs, in addition to their own 22lb gear, and that's generally standard, at least for the Marine Corp. My statement was to contrast those who could do it in the show to Shira. One was a Jounin-level Missing-Nin and member of the Seven Swordsman of the Mist while the other was an S-Rank ninja known as the No-tailed beast. Aside from them, no one else carried a 25-75lb blade (if not more, swords are heavy) with no exhaustion whatsoever. I feel like you should really read into what I say more than you do; it's a common occurrence that you don't take from my statements what I mean to commune.