I don't think the celtics win that championship if TD comes instead of KG.
I'm gonna disagree here, the Celts win either way.
As for freak-of-nature, once-in-a-lifetime player, I'm giving that award to Hakeem Olajuwon, not to either KG or TD.
The 2008 Championship squad had Powe, BBD, Brown, Posey, Perks and KG for its frontline bigs. Really, substitute KG for TD in that lineup and what does the Celtics miss? Pretty much nothing.
Ray Ray, except from the free throw line, missed continually for the first two playoff series. That could've been the end of it, there if it weren't for others to start scoring from the outside like House, Posey, Pierce, & sometimes Cassell. Finally, I believe w/ TD, the Cav's frontline (Ilgauskas, etc) would not have been able to stop him from dropping 30-40 points of them, all series long. That would have ended the semi-conf series in 6. We wouldn't have needed Pierce to drop 41 in that game 7 but he might have, perhaps a game or two earlier.
And finally, given the scoring prowess of both Pierce and Ray Ray, starting with the ECF, I don't see how our fortunes with TD would have gone down in the final series.