Oro didn't use Sasuke at all. People are obviously mistaken and can't read the manga so I'll post some facts here.
- Sasuke went to Oro for training to kill Itachi.
- Sasuke falsely promised for Oro to takeover his body
- Sasuke disposed of Oro once he gotten strong enough to take on ITachi himself
- Sasuke added insult to injury by taking Oros power before leaving.
Sasuke used Oro up like retro jordans and then disposed of him when he got bored.
- Sasuke went to Oro for training to kill Itachi.
- Sasuke falsely promised for Oro to takeover his body
- Sasuke disposed of Oro once he gotten strong enough to take on ITachi himself
- Sasuke added insult to injury by taking Oros power before leaving.
Sasuke used Oro up like retro jordans and then disposed of him when he got bored.