There's plenty of information out there providing the contrary, although it also largely is due to the fact that his market collapsed, Boston offered 14 million per year, LA 23.
You can't compare the two, unless boston was offering 2 years 45. But only player of his caliber would have taken the one year deal and assumed he could make more than $9 million per year the next year.
La offered more money in retrospect, assuming he didn't get injured this year and could never play again. Assuming he could get more than 1 year $9 million LA offered more money to Teoscar.
That's why he signed with LA, not because he didn't want to come to Boston. I'm sure he was much happier to go to LA and win but he would go to Boston in a heartbeat if we offered more money.
It often comes down to money.