I'll try to help here...
I think that a major problem that you're having (other than mis-valuing Kyrie's worth) is overvaluing Baynes' role on this team. Sure, he's playing fantastic on Embiid, but Brad wants to play Horford at center... that's his preferred lineup. The role of a "big center" is not something that we want to design our team around. It's something that you have in your back pocket in case the match up needs it. The Celtics will never give up any serious pieces for a big center, and especially not Kyrie. There has been a lot of precedence for this over the last 5 years and I don't see it changing any time soon. They basically only dig deep for value free agents on low salaries for this role.