I'm betting all 30 GM's, even if interested in Spooner, let him clear.
If Spooner and Rattie get claimed, the Oilers would no longer be over the ceiling and off the hook. I'm sure other GM's are hoping they can cash in by collecting some other assets from the Oilers to take some of their bad salary (like Spooner).
If Spooner clears, Chiarelli still needs to clear something like 500-600k less than what Spooners buried cap hit is, so he'd probably get desperate enough to shell out other assets to get rid of the contract if it's still on the books...