What in "can see the aura" you don't understand? It's never been stated that invisibilty counters that, not to mention that it's never been stated that Shiryu's fruit counters CoO. Fujitora is blind, he can't see at all, but he can see auras, Shiryu won't counter that.[/QUOTE
It's been confirmed that it counters CoO, Moria an expert CoO user could not sense Shiryu, Fujitora paints pictures of his enemies in his mind by using his powerful CoO, how can he paint a picture of an invisible man?