With the mess Watson is in, his value is plummeted. The owner of Hou is a chuch going person i once read. He doesn't want Watson to wear the Houston uniform ever.
What if,
we offer 2022 and 2023 first for Watson, and add a 2022 second if we have to, to make the trade for Watson. With the stipulation that, in the situation that Watson cannot offer his service, the trade is in nullity. Now you see why 2021 picks are not in the deal.
What the deal does is, if Watson clear up his mess between the draft and season start, he will play for dolphins. If he ends up in jail, then no deal, we will not lose any future picks. And thats why 2021 picks are not in the deal.