1. Russell
2. Bird
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3. Havlicek
4. Cousy
5. Cowens
6. McHale
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7. Pierce
8. Sam Jones
9. Heinsohn
10t. Parish
10t. Sharman
The first two are clear. I think the second tier can be arranged in any order, and the third tier is a little subjective.
I think a player needs to play at least five seasons here to be considered one of the greatest Celts ever. Great players who just missed the cut: D.J., Tiny, Macauley, JoJo, Reggie.
As for the original list, anybody who has Dave Cowens as the ninth best Celtic of all time, and leaves Pierce off his list completely, doesn't know what he's talking about. While I love D.J., he wasn't nearly as good a player as Cowens or Pierce. He was an extremely important piece to our championship squads, but he just wasn't on the same level as some of the other Celtics greats.