I'm afraid you can probably guess my response in general:
All of the differences are explained by the plane contrail hypothesis with different angles, different times, different light from a setting sun, and/or different flightpaths. Still they all look like the same kind of object phenomenon.
That's what I see anyway...
The Youtube guy took his vids at the same time of day, same place and, one would think according to flight schedules, the same daily flight. It was established early on in these discussions that they fly those routes the same way every time.
I’ve spent 30 aears at Kennedy Space Center and at Cape Canaveral and I’ve watched more shuttle and expendable launches that you can imagine.
The contrail in question was not a fixed wing aircraft. Contrails begin to evaporate fairly soon after generation. Additionally, the exhaust trail in question has a shape, depth, density, and opacity that is totally alien to contrails.
Ladies/Gents, that is the exhaust trail of a solid propellant rocket; not a liquid fuelled rocket or aircraft contrail - SOLID PROPELLANT ROCKET.
Now, who launched it is another question.