Smart deal. IF he sucks they only paid 6mil. If he comes back, and since we don't have his charts to make a prediction then they got a tradable asset as he will want to establish his bird rights and one season might not be proof enough for some teams.
If Lebron wants in , they can take him off the books.
If he plays well they can trade Anderson with another yoot and maybe get a top 5 pick in return.
Tanking holds no promises anymore and if anything the statistical probabilty of having three no.1 picks in a row has stretched lady luck.
They have a nice future three years after lebron bolted.
If he wants back in they could be built for a very long run with that kind of Yoot and talent.
If not they can always trade for more experience.
Just me guessing but I would have to think Lebron would find it very appealing to win a chip in cleveland and make good on his mistake. I don't know Lebron but from what i read I don't think he regrets leaving, but regrets the decision.