There are strong arguments to be made for each position and I will be okay with whoever they decide to keep - the talent depth is so good this year.
My guess is they go with 7 LBs. You have the 3 starters, Thompson as the primary backup, 2 of Lacy/Stanford/Alexander as your ST regulars and added depth, and then hold onto Vosean Joseph as a game day inactive. I think they want to continue to develop him, but he probably won't clear waivers to PS.