If it were a contrail, that shape is only possible from a center line thrust aircraft. Problem with that theory is there are no centerline thrust aircraft used in the flight profile being touted as the “answer”. Only acft like 747, 757, 767, airbus 3XX, etc.
Why are you quoting an ANONYMOUS blogger and his/her blog as gospel?
Who is this Unicus you are quoting as an expert?
Does he or she have a real name?
What are his/her credentials?
Please tell us why this “Unicus” is the almighty expert and spokesperson for the “It wasn’t a Missile” cult.