Whether or not it should be single or two pilots, with or without an AP, is a conversation that may not be appropriate at this time. Until a reasonable investigation has concluded the casual factors for this tragedy this conversation, as valid as it may be, might be better taken up in another thread as not to presume anything about this terrible accident.
There but for the grace of God go we.
My condolences to the family of the departed, his family and workmates.
Rest in Peace