Yes Oro wants sasuke bad.
Kimimaro was originally Oro's first pick.
The immortality jitsu that Oro created is still in the dark. It could be that oro's soul is just loose and can inhabit anyone's body... hence.. that means he CAN'T use his arms again because the third cut off the arms of his soul.
And yeah... sasuke a power greedy little puss and ran off to sound.