FTX's Alameda Lost Track of $50M at a Time: 'Such Is Life'

The "Notice of Filing..." at https://restructuring.ra.kroll.com/FTX/ says

  While Singh, Wang, and Ellison have pleaded guilty pursuant to cooperation agreements with the Justice Department, it is generally not feasible for the Debtors to interview them on key subjects until after the ongoing criminal prosecution of Bankman-Fried has concluded.

Why is that? Don't you want to interview them ASAP?