oro never once said that he joined akatsuki to take itachi's sharingan, he only said he left the organization because of itachi being there

it should be reasonable to assume some guy who's bent on learning all the world's jutsus wouldnt need an ulterior motive to join an organization that is working to obtain the strongest jutsus

besides, oro never settled on taking the sharingan bloodline until after he lost kimimaro, which mustve happened within the past 7 years


and when the akatsuki said "oro left 7 years ago"....we dont know exactly when in the storyline they said that
for one thing.
Do we know how much time has passed since the time they first mentioned itachi's age and the time when the akatsuki guys said 7 years? Actually, where did they even mention itachi's age?