Munford seems the easiest call to bring back because it's likely a minimum or close to it type of deal. We signed him off a team's practice squad, which is a reflection of how the league sees him and that's a position where you need tons of depth bodies.
Lower would make sense to bring back, but he's right on that edge where some desperate team trying to find lightning in a bottle with a low cost starter might offer him more money than you want to pay a backup.
You forgot Jack Gibbens at LB who probably falls somewhere between Lowe and Munford. Likely a minimum or close to it depth type contract that is a no brainer to keep, but if anyone offered him any sort of real money probably let him walk.
Tonga plays a devalued position that you're always going to use rotations at so seems like a good guy to bring back for depth. I'd love to see us actually prioritize a dominant NT even though it's not on a lot of people's radars. I think it would unlock a lot on defense if we added that to go with the great 3Ts we have. But Tonga is a good stop gap rotational piece that I would imagine is priced fairly.
Hawkins is a JAG/stop gap type of player IMO. If we upgrade in free agency, he'll be too expensive to pay as a third safety in a scheme that doesn't use that much. But if not, he's a fine guy to keep for stability. Should be looking to upgrade him in the draft though.
Hooper is fine to bring back if they don't upgrade in FA. Considering Henry's age this is a sneaky spot to spend for an upgrade on while it's a want instead of a true "need" though and Hooper might just get displaced through that. Good fall back though.
Chaisson is the big one. You're talking abut a depth type option but a position where depth type options are expensive. I think it really depends on how much money he gets offered and what the other options are. They have to come away from free agency with a starting caliber DE, whether that's Chaisson or someone else. At least one. They'll have to weigh Chaisson's contract value against what else is out there.