Like it or not, Josh Brown will stay. The team needs to expose one under-contract D who meets the games-played minimums. Brown is that guy.
I also think that if Tierney is not traded prior to the ED he should be protected/kept. Losing him for nothing at the ED would be poor asset management.
Assuming they trade/protect Tierney and expose Watson in the ED they will also need to acquire one more F who meets the criteria.
Wolanin’s struggles also open up a potential D slot at the ED, so as others have said teams with 4+ good veteran D signed should be targeted as trade partners (Buffalo, Calgary, Carolina, Colorado, Minnesota, St. Louis, Washington)