First of all, at the time of his trade, his best days were not "clearly far behind him". He was actually having one of the most productive offensive years of his career.
In addition, there are two pretty significant differences:
- Boston was only married to him for the remainder of the year, as he was a UFA-to-be. This decreases Boston's risk, and thus increases Kaberle's value.
- Boston clearly had targeted and wanted Kaberle very badly. Burke was likely able to get what he was for this very reason; he would've otherwise allowed Kaberle's contract to simply expire, and let him walk, so he had leverage in that respect.
A rental player has more value than a franchise goaltender. Interesting King.
You can call it increased value because the Bruins weren't "married"/committed to him - what they got in return for Colborne, a 1st and a 2nd were 20 points in 50 games - and then vamoose...
He was having an average year in Toronto, and only 3 goals in 58 games - I hear you referring to Luongo's alleged decline all the time (as well as the Sedins, Burrows, etc) - by your standards, Kaberle was about to collect a pension.