you're an idiot because bee spanked him in sword arts and general spanking WHILE sasuke has 3 tomoe out and even MS. you must be crack popping your rectal gland.
Your mistake her is assuming sasuke's swordsmanship skills remained stagnant through all of part 2, I might as well say that because Naruto Naruto couldn't keep up with Madara at first then he'll never get better but in a short period of time his skills have improved and we've seen him pushed to his limits and beyond, sasuke's kenjutsu has also improved since the killer bee fight,
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here you can see that sasuke was able to deflect a blow from master swordsman Mifune whose blows are said to be quick enough to cut a shinobi down before they can even weave signs, and sasuke did this with 3 Tomoe, if OP is talking about adult Sasuke which he us, them adult Sasuke us much better than killer bee especially with MS, EMS and Rinnegan where sasuke's clarity would be so heightened that his strikes would be incredibly precise and swift.