It looks to me that this list was highly influenced by the WJC's. Grebs is of course down, because he has been injured for most of the season.
The real shocker for me was that Tambellini was left off. His sophomore season has not been nearly as impressive as his first, but he was quite solid for Canada even though he got mostly fourth line duty.
I agree with your assesment on Tambs. I seen almost every game of that tourney and he was grand. If he would have been given the ice time that Dixon the waste and a couple of others had he would have had more than 7 points. Not that 7 were bad, allot of big names who for some reason came in higher in HFs rankings had allot less and way worse showings then Tambs did, but, time will prove this ranking dead wrong.