If we are going purely on talent, you still have to put Russell at #1. I'm surprised at how much he gets undervalued around the league and even on here by Celtics fans. He's the all-time greatest NBA player ever. Decades ahead of his time. Unbelievably athletic for a guy that size. He could dunk from the FT line too. He would be just as dominant today.
After Russell, I'd say Bird is up there, and so is McHale. People undervalue McHale's pure talent and skill level, because he sacrificed so much on that team, and was not quite as hungry a player as Bird.
Durant would be about 4th or 5th, just about even with KG, and slightly above Pierce. Pierce is another highly under rated Celtic great. On pure talent, KD slightly beats him, but Pierce has accomplished more with less, and is our all-time leading scorer, one of the greatest scorers and clutch performers in Celtics history.