Moving Drew first doesn't give Fegan leverage. It actually removes any rationale Andy may have had for looking elsewhere, because it hands him the starting spot next to Z. It encourages him to sign a long-term contract with the Cavs and not just accept a qualifying offer. A 3yr offer like Drew's would allow him to showcase his talents and potentially earn a bigger payday, or he can go for a longer term offer and financial stability.
Yes, we need to re-sign Andy, but he's restricted. He's not going anywhere and likely never was. If we had forced him to accept less because we kept telling him we're not overpaying for a starter, and then turned around and signed Bibby and announced Andy was our guy all along ... how do you think that makes him feel about the organization?
As I've been saying... it's a lot easier to sign free-agents when you can promise them a starting spot and solid minutes.