I wouldn't include Tatum in the deal unless I was 100% certain Davis was re-signing in Boston long term.
If you get 3+ years of Davis guaranteed alongside Kyrie, then it's worth it, although still hard to swallow.
If you're trading Tatum for only a year or two of Davis with no certainty he'll stick around longer, no thanks. The league is still too stacked at the top to be sure that Kyrie - Davis is going to result in a championship if all you get is a year or two.
Based on Lowe's reporting it sounds like Davis is thinking of doing what LeBron did in Cleveland and what Durant has done in Oakland. Just sign a bunch of one year deals and keep the team that signs you eager to keep you happy. I would not trade Tatum for the "privilege" of worrying about whether Davis is gonna resign every year for half a decade.
I didn't read it that way, I read it more like he was going to sign 1 year deals at maximum value until he could cash in with a 5 year full max at 35%. In other words, make up for missing out on the super max by maximizing his value until he can sign for that 35% anyway.
You're right, that's the financial aspect of that plan.
But the practical effect ,whether Davis intends it or not, is that the team that he's on will be uncertain about whether he plans to re-sign and will feel pressured to keep making win-now moves to keep him happy, just as the Cavs did (twice) with LeBron. It will also mean that "What will Davis do in FA?" will be a perpetual question, as it has been with Durant.