Everyone else could intend that he shows up and does the formally right thing but that doesn't mean he won't just tard out instead, show up at a plea hearing, and refuse to actually plead, or make a nonsensical plea that doesn't qualify as a guilty plea.
I think that's exactly what has been happening. They bring him into court, plea deal in hand. Chris tards out, either after hearing the plea deal, or more likely before they get a chance to offer it. The court grants another continuance, "Mr. Heilberg, please get your client's shit together." Rinse. Repeat. The intervals have been increasingly long, possibly hoping more jail time will convince Chris to stop fucking up, and recently they sent him off for "evaluation" in hospital with extra how-to-behave-in-court classes on top.
It all seems to be one long effort to get Chris competent just barely long enough to properly plead guilty (and then bundle him off to a tard farm for long term care as part of a plea deal), or plead innocent / not guilty so they can properly convict him (and then bundle him off to a tard farm for mandatory therapy as part of his sentence).
But Chris isn't having any of that, "Mumble mumble dimensional merge mumble hedgehogs mumble." The next hearing should be interesting. if only someone could be there to document it (weens ruin everything).
He previously has in the past but he seems pretty far gone now.
In the past, Barb was likely the one who convinced (browbeat) him to take those plea deals. Somehow i don't think that's going to happen this time around.
As to allocution, if, by some miracle, Chris actually does make a proper guilty plea, I suspect the judge would ask him once, and only once, to confirm that plea, offer up a silent prayer of thanks, and then a further prayer that Chris keeps his goddamn mouth shut so they can finally wrap things up without further retardation.