The fact bits of it were falling off as it came down points to a meteor.
Exactly.
Now, if you really want to see something odd...compare that video (and Chelyabinsk, and Peekskill) with this:
http://apod.nasa.gov/apod/ap090302.html
http://transientsky.wordpress.com/2009/08/20/meteor-or-not/
http://astronomy.activeboard.com/forum.spark?aBID=58381&p=3&topicID=14907382
This object, according to Gary Kronk, stayed in atmosphere for 1,500 km. The super-8 footage shows it staying together rather well--not breaking up despite its very long track.
It skipped out into space and was to make a resonant return in the 1990s.
Now that contrail looks as smooth and as laminar as a baby's bottom--and it reminded me of the stardust aeroshell and the like that came down over Dugway proving ground
You probably remember seeing Teton on A.C. Clarke's mysterious world--and you also remember the Leonov aerobrake in the movie 2010.
Stardust--which we know was fashioned by intelligent hands-- has a steady contrail look that reminds one more of Teton than anything else--no great chunks--no flaring. Very even.
Teton was most likely a nickel iron slug--but if a Bracewell probe wanted to do a resonant return--and had to bleed off some speed--it would look a lot like the Teton event of 1972.
Something to think about.
http://www.setv.org/online_mss/seta83.html
The point is that an ET craft is not going to look like disco lights--it will just look a lot like Stardust...or a steady meteor.
"They" will have to aerobrake too--same as us.
If there are alien probes, they will be very old, likely in bad shape, and obey the same laws of physics we do.
I will say this--if I wanted a conspiracy theory, I'd say the recovery of this object in space--and not Hexagon--was the real reason for the STS orbiter having such a big shuttle bay.
Launch a Titan-Centaur to bring the thing back to LEO and circularize--and rescue with an orbiter before it falls apart.
There is your First Contact movie done a la Hard SF.