I have discussed the video with another very experienced Chinook Pilot and he pointed out some things he sees that add to my input here.
His perceptions are similar and I agree with his description of what he "saw" as I noticed that as well....generally looking at the Aft Rotor Blades and their coning angle during the video as it progresses.
The camera angle and quality of the video does make it hard to make out the full range of movement and angles but does help.
The crucial issue shall be if all of the control linkages and structure supporting them were recovered.
To say the control linkages are a bit complicated on the Chinook is a bit of an understatement but as in any aircraft it can be traced if the parts are still there to be examined meaning if there is a missing bolt, a failed rod end, or a broken mounting flange or other mechanical failure it should be discoverable.
For some light bedtime reading......Section 11 pertains to the Flight Control system.
https://chinook-helicopter.com/Publi...Operations.pdf