I think you have no idea what Kemba Walker is really valued at around the league.
Kemba is actually both a better offensive player and better defensive player than Kevin Love. If both had to guard Giannis or Zion or Randle, my bet is Kemba would do a better job on them.
Also, with Garland and Sexton, why is Cleveland trading for Kemba? To buy him out of the $73 million owed to him as you suggest?
I agree that this would be a terrible trade for the Celtics.
But I wonder what you think could be a hypothetical return for Walker?
In another thread there was a Chicago suggestion: Thaddeus Young, Tomas Satoransky, Al-Farouq Aminu (the latter should be going to a 3rd team to limit tax costs by the way), which I find reasonable.
Not fond of the Moranis - Clippers possibility (Beverley, Morris, Zubac), which includes longterm overpaid contracts and two guys I really dislike watching.
I do not like moving a dollar for four dimes, which is what a lot of proposals are. At this point, if I am moving on from Kemba it's to trade up not down. Or maybe a lateral move.
Kemba is most likely going to give this team an excellent 3rd option for the next two years. 19/4/5 with average to above average shooting and scoring efficiency is tough to find in this league as a third offensive option.
With young superstars you need to have some of the best #3 and #4 offensive options in the league. You can't have those guys be good to "just another solid veteran guy" level of players. These trades do that.
I say look for a team looking to tank either this off-season or at next year's trade deadline. Could Indy or Toronto look to blow things up? If so would Kemba and some 1sts get you a Sabonis, a Brogdon, a Siakam, a Beal? Would Jerami Grant/Corey Joseph duo for Kemba and picks be equal value if Detroit decides they want more shots at nabbing a talent in future drafts and can convince Kemba not to pick up his option? Could these deals be built up into a three-way that shuttles Kemba elsewhere?
I think keeping Kemba or trading him in something I have proposed is much better use of Kemba for Boston going forward. Maybe it's because I don't buy the very popular trope of "Kemba doesn't fit with the Jays". Maybe it's because I don't buy the concerns over managing arthritis in his knee. Maybe it's because I think Kemba is still a great player. Maybe it's because I just like Kemba, he seems like a good dude.
But, I wouldn't salary dump him, trade him in an awful trade like this, or trade him for 3 mediocre vet role players.