The situation was messy and personal, but Williams also pointed out he wants more guaranteed money in his contract. For 2020, his deal contains no guarantees, and perhaps that's the only hurdle remaining for Williams' return to Washington.
https://www.nbcsports.com/washington...use-ron-rivera
First preference was to trade him for a 1R or even a 2R plus
Second preference was for him to sign a reasonable 3 year deal and stay
Third would be to guarantee his 2020 then he walks into FA in 2021 (assuming 2019 was an accrued year)