The NASA timeline centers on Left wing DAta losses, elevated temperatures, etc. Culminating in the crew acknowledgement of a High Temp Warning in the last minute before breakup.
That coupled with the knowledge of the debris striking the Left Wing during Liftoff starts to paint a picture of what may have been the cause.
Just rank amatuer speculation, but putting together the facts that something struck the Left wing during Liftoff, and now the NASA acknowledgement that all the abnormal indications came from the Left Wing -- it seems that these astronauts were doomed from the start by a string of tragic circumstances.
My sincere prayers and condolences to the families and friends of these brave pioneers, and to the entire NASA family.