I personally only want to hear from people who were there when Michael was alive and who haven't yet testified exhaustively on criminal trial. So I would vote no to paramedics, investigators, hired experts etc. as well as probably Kenny Ortega, Michael Amir Williams, etc (unless it's clear from the media reports that they had something new to say), but definitely yes to family members, Murray, Phillips, Branca, MJ's past doctors, etc.
And 3 days delay is perfectly fine. It's not about knowing first, it's about having a fuller picture in perspective.