I think none of these guys are must-signs. Money has to be right.
Tru is not worth what we would have paid Jenkins, going from a pure ability standpoint. He's just not a #1, and doesn't show the consistency or potential to become one. Still, and depending on what else is available, keeping him at 9 to 11 million might be our best option. Would it be worth it? Eh. He's better than average, good but not great. Depends where the scheme goes and and what the market dictates. He's not worth losing Ogletree or A. Donald over, that's for sure.
T.J. is a good player I want to keep. He's our best safety. That said, we have safeties, and his price-tag can't be too high. Offer him what Philly gave McLeod, and let him test the market if he doesn't like it.
Britt... mixed feelings. He's our best receiver, inconsistent though he sometimes is. We lean on him, which makes his shortcomings more apparent, however, I think he would be stellar as a #2, and thus should be kept around at a #2 sort of price. If he's looking to cash in, which he probably will be, he'll be a bit too expensive, I think, but we'll see.
Greg Z is a much better kicker than he gets credit for, I believe. This might be a little bit involved, but... People point to 2015. The kicks he missed that year, for the most part were deep ones that the coach put on him because he didn't trust his offense. He was 12/13 inside 40 yards, 5/8 between 40 and 50 (2 blocks), 3/9 at 50+. That year, against the packers, he made a 40-yarder, had a 50-yarder blocked, missed a 53-yarder, and a 63-yarder. Against the browns, he did miss a 35-yarder(That was his lone sub-39-yard miss). He had one more miss... another 63-yard attempt. Against the Ravens, he had an extra-point blocked, and missed a 53-yarder. Against the Vikings, he had a miss of 48 yards, along with makes of 61, 35, 53, and 45. His first game against the niners, he had a 40-yarder blocked, and made his other kick. In the final game, against the niners, he missed a 52-yarder, and had a 48-yarder blocked, making 3 other kicks. All this is to say: we should keep him. Not only is he serviceable, he's a plus-kicker, with the leg to make the occasional deep one if absolutely necessary, and good accuracy and great consistency under 40 yards (something that isn't necessarily a given), and I would argue under 50 yards. I would pay Greg Z as much as any but the best kickers.
Benny is a nice player for us, a glue guy, someone willing and able to perform at a high level with limited snaps. We ought to keep him for RB2 money, but shouldn't be afraid of letting him go, if there's a much higher market for him
(I doubt there will be). We have backs, and can bring backs in, able to do what he does, at a similar level, and at minimum contracts.
Anyway, these are my takes. I guess I'd say the closest to a must-sign is Zuerlein.