I have to agree with you on that, they have a new star now which is Tatum.
On their win against the Utah Jazz on the road, he just only scored 33 points with 11 rebounds and his stats are really improving.
That win happened without Walker so they are now a real dangerous team and they don't need Irving again to destroy their good chemistry now.

I bet Walker is liking his stay with the Celtic as he does not have to do it himself just for the team to win.