KG's first season here he was the most dominant defensive big man I have seen. I dont know why people always say that defense wins championships and then harp on the offensive players. KG won the award for 'defensive player of the year' that season.
You can argue that KD is the best offensive player in the league but again, it's already been substantiated by the league that KG was the best defensive player. For that reason, and the fact that we won the title his first year here I still put KG above KD. McHale too was dominant and his combination of offense and defense was amazing and puts him right there wth KD in my opinion.
I say KD falls behind Russ, Bird and KG and is ties with McHale, Havlicek and maybe even Pierce. Let's not forget who went toe to toe with Lebron and Kobe in the playoffs and came out on top! Until KD takes us to the Finals I'm not putting him any higher.