Oscar was a poor ball handler, atrocious defender and below avg shooter. He caused issues with the team dynamics, he didn't even live at the lodge, he didn't appear to take well to hard coaching, and he didn't possess much athleticism, so lob options were pretty limited.
His one great skill was rebounding, but even that often came at the expense of other things. When you give up more than you offer, you're just a net negative.
As a person, Oscar seemed like a good dude who could really connect with fans. As a player who can help a team reach a championship level, Oscar seemed like a liability.
I'm much happier with what we currently have, and the 3 bigs are all a better fit for this team.