I don't think Courtney Lee has any value to Milwaukee.
Monta Ellis and Brandon Jennings start there. That is not going to change. They both play 34-36 minutes a night. There isn't many minutes available behind them. They get good play out of Beno Udrih behind them and they regularly need his ball-handling and shot-creation off the bench.
Then they have an overloaded SF rotation with Mbah a Moute, Tobias Harris and Mike Dunleavy. Plus Marquis Daniels and Doron Lamb behind them.
There just isn't a large enough role there for Courtney Lee. He'd be a bit part player in Milwaukee like he'll be a bit part player here once Avery Bradley returns. Not enough available minutes.
If they trade Monta Ellis, this can change. But not before then.
I can see a scenario in which they value Lee more than Udrih as their 3rd guard: better defense, better shooting, a guy who will keep Ellis or Jennings on ball and off the tougher defensive match-up.
I heard that Skiles was pursuing Kirk Hinrich in the offseason, indicating that he wasn't ecstatic with Udrih as his 3rd guard - I think Lee's defensive skillset + 3 point shooting + modest ball-handling ability could make him similarly appealing to Skiles.