Because cle is terrible defensively. And Stevens is a better coach than Lue.
Boston already plays the warriors tough. Boston basically splits with them now. Adding lebron with the personnel n coach Stevens they can beat the warriors. And you can hide lebron on defense with Bradley/smart/crowder/horford/olynyk etc. they match up well. Other than pop Stevens is prolly the best coach in the league.
You not beating GS unless you can get somebody to at least hold Durant to 25 points. And as the world has seen that somebody ain't Lebron. Curry can be stopped, the issue is that nobody in the East right now can slow down KD. And if you double KD then Curry and Klay will kill you. Whatever team he goes to needs to have a HOF level wing defender to slow down Durant, then he can use his size to create mismatches defensively like he did last year against Curry, and this year against I.T.
Love can score in the post with his back to the basket, is a HOF level rebounder, and an excellent passer.
Y'all some good azz lawyers