If Burke wanted Schenn so bad, why was he holding on to Kaberle?

--The Thrashers, with the No. 4 pick, would have surrendered it for Tomas Kaberle and the No. 7 pick, paving the way for the Leafs to draft Brayden Schenn or Evander Kane. But Burke did not want to use Kaberle to move up in the draft, so that negotiation went nowhere.
via The Spin.

I'm surprised Burke wasn't willing to part with Kaberle, given how miserable he looked when the Kings took Schenn. What -- did he think he was going to luck out and the Kings were going to pick Cowan and PHX was taking MSP?

Frankly, it's odd that he talked so much about moving into the top five since he was unwilling to deal Kaberle, who is the best chip he has to play. He was going to send him to Boston for Kessel anyway.