Wasn't Kayla's plea already way after Nick's? It's possible the deal was he takes the fall for everyone else. There would be no reason to file anything in her case until its time to dismiss or proceed. They did Kayla's Omnibus because the deal wasn't finalized yet and it was set close in time.
Not to give Nick any credit but that always seemed to be in the works when they inexplicably set her next hearing to
June instead of a month or so out in the ordinary course. Some speculated at the time that this was just because of a backlogged court calendar but first of all that explanation isn't consistent with the tight scheduling in the other two cases, and secondly all it takes is a simple hearing search by judicial officer name in MCRO to plainly see that Wentzell has
plenty of open slots way earlier than June.
The only plausible reason for them to bump Kayla
that far back is because they need to make sure that Nick, being the mercurial flake that he is, actually follows through on the plea in January, actually follows through on the PSI and sentencing hearing in February/March, and perhaps even dips his toes a ways into the probation period's routine in March/April without any harebrained motion to withdraw the plea or some shit. Whenever the state finally feels comfortable that he's irreversibly locked in,
then they'll go ahead and drop whatever the pre-arranged plan already is for Kayla, with no occasion to file anything one way or another in the meantime.
It's anybody's guess whether that plan would really be an outright dismissal like April's or just pre-agreed plea terms owing to the case against Kayla being stronger than the case against April etc., but in either scenario they would have scheduled so far out as June just to put her on ice with no need for the hassle of piecemeal postponements while they wait and see whether Nick tards out or not.