Jack dorsey didn’t create bluesky, and he had little effect on it.
He started the team for bluesky after reading protocols, not platforms. They were given a lot of independence from twitter (so much so that they were able to continue as a separate thing after twitter got musk-ed), but the goal was to eventually implement the protocol they come up with/choose on twitter.

He was on their board for a short period of time, but ragequit and deleted his account after they started moderating content.

I also find the idea the people working on bluesky are “holding back” the decentralisation efforts funny, considering they are making literally no money right now.