You go over max crit chance...Yasuo double the crit chance with his passive so you have 110% with this build...10% more and unuseful. if you want you can use the Executioner's Calling and the Infinity Edge to reach 90% and have 50% more crit damage and then equip other more useful items. Anyway the best way 4 me is to use the Youmuu's Ghostblade with Infinity Edge to power max all dmage as possible cause the Youmuu gives you an Active ability so usefull and the armor penetration at the same moment with CD Reduction and Crit and AD.