I thought Oro Wanted Sasuke primarily for his Sharingan?? if he has Sasuke's Sharingan, he can learn 'all' the jutsu's in the world just by seeing it being done.

rather than Kimmimaro. Who would be a perfect body. But I think oro wanted Kimi's body because at that time he was dying because of the sealing jutsu. Or he wanted Kimimaro 'NOW' and Sasuke 'Later'.