There is a lot of speculation, murmuring, rumors about potentially another coach (or even two) also leaving, and since those rumors have yet to be squashed, it's highly likely that one or two other staff members are currently in the process of exploring other options that also haven't been finalized. Assuming that Frost wants to bring Dawson back, it's not necessarily an open & shut case that he would just take over DeWitt's responsibilities as Special Teams Coordinator and OLBs Coach. He could, but I'm not aware of him having a lot of experience with ST; does he? On the other hand, both he and Tuioti have coached both D-line and OLBs, but Chinander has also coached LBs, and it's relatively common to have a DC who also coaches a position group. Add in the potential for another coaching change anywhere, and it might make more sense to hire a new coach who coaches that group in addition to heading up ST.
I suspect that there are a lot of moving parts and potential moving parts, right now, and it's still being sorted out. Depending on how many coaches are coming and going, it's also going to affect the salary pool, which also affects contracts, which could cause a guy who's coming in to wait to commit and/or the AD & Head Coach to wait to make the announcement. At the same time the folks in and around the athletic department are going to be seeing names and responsibilities and figures, and some of that usually leaks out before things are finalized, ... which leads to lots more rumors and speculation.
Here's what I suspect based on the amount of rumors flowing: Dawson is coming back.
Here's what else I expect: some coaches, like Fischer and Held, are probably going to get significant bumps in pay for the stellar jobs that they've been doing both in their coaching and in their recruiting, and both are relatively lightly paid and could be targets to be poached away by other schools. There were rumors that other schools wanted Fisher recently, which was apparently what fed the Francois signing-day drama.