We need to wait a couple of months to pull this one off (due to restrictions on players being re-traded) but I think the parameters are there for this one to work out:
Boston trades: Ray Allen, Kevin Garnett, Glen Davis, James Posey, Eddie House, Scot Pollard
Boston receives: Al Jefferson, Ryan Gomes (S&T), Sebastian Telfair (S&T), Jeff Green, Wally Sczerbiak, Delonte West (S&T), Yi Jianlian, Trent Plaistead
Cleveland trades: Wally Sczerbiak, Delonte West
Cleveland receives: Ray Allen
Minnesota trades: Al Jefferson, Ryan Gomes, Sebastian Telfair
Minnesota receives: Kevin Garnett
Seattle trades: Jeff Green, Trent Plaistead
Seattle receives: BBD, James Posey (S&T)
New Jersey trades: Yi Jianlian
New Jersey receives: Eddie House (S&T), Scot Pollard (S&T)
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Why for Boston: We get a group of young players to supplement the current potential on our roster, and get a true post player in Big Al. KG is at his peak trade value, coming off a championship; this gives us the opportunity to cash him in for some legitimate first-tier young talent. We trade Ray Allen for an expiring contract, which allows us to reload at the trade deadline.
This trade opens our window of opportunity by several years, setting us up long into the future. It also allows us to play small ball on a full-time basis, by shifting Big Al over to center and playing Gomes at PF.
C: Perk / O'Bryant / Plaistead
PF: Big Al / Jianlian / Powe
SF: Pierce / Gomes / B. Walker
SG: J. Green / Wally / Giddens
PG: Rondo / Delonte / Telfair / Pruitt
You can't go wrong with that roster. The only downside is that we have to cut one player to get down to the maximum roster size of 15.
(Yes, folks, the above was tongue-in-cheek.)