Buying out Montador and Olesz just made too much sense. Can't bury them without taking a cap hit anymore. They both have little time left on their contracts so the cost to buy them out isn't ridiculous. This will save the Blackhawks right around $5mil in cap space, to get them to approximately $7mil+ for the time being.
Hossa didn't make sense from a hockey point of view or a business one. The only downfall to Hossa is the length of contract and how if he retires it will still count against the Blackhawks (as of right now, but a lot can change). For a $5.2mil cap hit, Hossa is well worth the money. Blackhawks would have had to pay Hossa $23mil overtime if they were to buy him out.