Is it possible, that the DA's office, with limited staff and someone said over 18k pages of discovery in this trial, was not fully prepared when the trial started? Remember the poster who said they "picked" certain judges for certain trials, because they had the rotation schedules? Maybe this judge came up, they were almost ready to go, but not quite, but they wanted Gessner for sure. The Cisco witness contacted in February? And this trial started a couple of weeks later? Maybe what he had to offer was not really know/understood when they started, along with several other witnesses who have seemingly been introduced out of order.
My take - opening statement brief, cause they truely didn't know what all they had. Smoking gun? They're still hoping to find one. Neighbors, et al? A stall technique, to give the staff more time to interview, review statements. Blanket subpoenas to CTA.