KD isn’t a realistic option.
KD would 100% be an option IF Kyrie was happy here. But Kyrie, right now, is not happy - so you're correct now.
If Kyrie was happy, resigned and told KD how great it is to be a Celtic, I feel like we would be the favorite if he left GS. If Kyrie leaves and goes to NY then they would be the favorites.
A few reasons..
KD and Kyrie are best friends and want to play together
DA has been trying to get KD since he was in college. He watched KD vs Oden with KDs parents.
Boston was reported to be his 2nd option to GS
KD was a Bird/Cs fan growing up
If he leaves GS he would want nothing more than to win more chips. Stevens and DA would give him confidence that we could put the right pieces together and be a serious contender every year.