Sorry, i'm never going to agree with the above sentiment.
KG has never sustained a serious injury in his career and nobody they could have brought in was going to mitigate his absence.
Furthermore, the team won the title handily with the same C/F rotation as last season, with 3 out of 4 improving - Mikki Moore was always slotted to be the 5th wheel and no pickup would have played more than situational minutes.
Also, the wing rotation was fine for most of the year - RAY ALLEN played 12 mpg at SF as Pierce's primary backup, which shifted TA or House into the SG spot. Ray's off/def metrics were outstanding as a SF, so the team wasn't losing ground because he was playing the 3.
This brings us to the bench. Their biggest problem was not having a legit PG to bring it all together. The team was purposely playing an "near all bench" unit to limit the minutes of the starters in order to keep them fresh.
While the bench wasn't successful early, it didn't stop them from having the best record in the NBA, nor did it significantly raise the PT of the starters to danger levels.
Once Marbury was added, the bench started producing much more consistently and the rotation of players became more typical of a steady 8-8 man rotation.
If KG and Powe, (and Scal for that matter) had all been healthy the minutes for everyone would have remained down because KG's absence forces Doc to play Ray and Paul more in order to keep a scoring focal point on the court.
With a healthy GPA, the House/Marbury combo would be getting more consistent minutes because Doc would be able to keep KG on the court with them or any 2 out of 3 of the "Big 3" - KG's absence is affecting Doc's trust/usage of the bench right now, which is subsequently effecting their production - can't produce consistently if you play 8 minutes a game.
Finally - AINGE WANTED TO ADD VETERANS at the 3 key areas everyone has agreed on: C/F, SF, PG - he added 2 out of 3 before the deadline.
Its all well and good to point out the players the team "could have had" yet nobody wants to acknowledge the fact that most of the available players either re-upped for small money with their current teams - Anderson, Finley, Barry, Lue - or looked for more dollars or more years on the contract - Posey, Barnes, Maggette....
Its not like Ainge didn't make offers to other players, but a good deal of his off-season was taken up negotiating with Posey - who was vastly overpaid - and his contingency options were simply not good value relative to their asking price, or were satisfied taking comparable dollars to stay put.
This off-season is going to have a much, much, much better caliber of talent that will warrant higher dollar offers from this organization - clearly certain lessons learned this season will effect decision making as well.
Harping on the "failures" of this past off-season ignores many of the truths of the off-season as well as the principles of team building and cap management - you don't out-bid Phoenix for Matt Barnes for instance - nor do you give Chris Anderson mid-level money coming off a 2 year rehab absence - looks great in hindsight, very foolish beforehand.
Boston had depth, was not equipped to survive an injury to any of the big 3, saw tremendous growth from their core group, had the 3rd best record in the league, and is in a great position to add quality talent of a high caliber this off-season.
Bottom line: if KG was on this team right now they'd be competing with LA and Cle for the title - to state otherwise flies in the face of their success with KG defensively, and is speculative in order to fit your agenda for vilifying Ainge for his off-season, which was far more calculated risk than unmitigated negligence.