I think Brockers is the most replaceable (they had already brought on Robinson to replace him).
I also think they have to think long and hard about Whit. We're entering the Twilight Zone with guys his age and his play has dropped off (although the games after his injury shouldn't count against him..... he was in no way fully healed).
Hekker? No way. That dude is a great kicker, holder, ST weapon with his passing ability.
Higbee? No way. Really good TE, young, very good blocker, good WR, good route runner, athletic and RELIABLE. In fact TEs are going to play an important role with the McVay offense going forward.
Havs? Maybe. If Evans is ready, then probably. Or, see if he might be able to take over on the left side. Don't laugh. There are some big, not so fast footed guys at LT these days, especially if you have a scrambling/running QB.
So outside of the obvious guys that will leave (Everett, JJ, and Floyd) Brockers and Whit provide the most bang for the buck and are the most replaceable with guys we already may have on our roster.
Hill also has a fair chance to stay if he'll do a cap friendly deal.... and Jourdan says he might.
Rams will put a 1st round tender on D. Williams. Or use him for trade bait in a Goff for another QB deal.