You're undervaluing Vonleh and MKG way too much

They would see Green and Bass as expiring fillers and then at the end of this season they have no Vonleh and MKG...would you make that deal?
But yeah, you'd need WAY more than just Green and Bass.
Start with something like:
2015 Clippers pick +
2016 Cavs pick +
James Young +
Bass +
Green.
You could take out the Clippers pick and offer Avery Bradley but they'd still probably say no.
As Endless Paradise said, MKG has been shooting better and playing very well for them this season so far. He had one stretch vs New York where he chased down three fast break layup attempts and stopped every player (including Carmelo, Shumpert and Larkin) from scoring.
He's an excellent defender and very good in transition.