camshaft retaining bolt
The camshaft retainig bolt is torqued to 63 ft-lbs during normal camshaft timing. Since the camshaft rotates one revolution for each two crankshaft revolutions only the equivalent of 31.5 ft-lbs is being applied at the crankshaft. However, this should be ample force to rotate the crankshaft with the spark plugs removed. How long has it been since the engine last ran?
Thanks for posting the photos looking down on the cassettes. Fortunately, the right (rear) guide assembly looks intact. Frequently the guide splits where the upper positioning bolt is. I suggest that you try to pull the end of the guide (on each side of the positioning bolt) upward with your fingers to make sure there is almost no vertical movement. Sometimes the guide will fail near the bottom allowing it to move vertically.
The left guide assembly also looks intact in the area of the tensioner (slack side). The photos don't show the outboard (traction) side. It appears from the photos of the primary internals that the "finger" of the left guide is what was jammed against the jackshaft sprocket. It is probably the piece on the upper right in the photo below.
Going back to your original post you stated that the engine seized during a morning cold start attempt. I think that's better than if the engine was actually running. There is less chance of mechanical damage. However, I am concerned that you have removed the pieces and the engine will not easily rotate. The rings could be rusted to the cylinder walls if it has been long enough for that to happen. Or the chain could have slipped and a piston could have bent a valve. Since you can't easily rotate the engine try measuring the angle of the timing slot relative to the head for both camshafts. The photo of the right timing slot indicates about 40 degrees. The left will be hard to see since it is up against the firewall.
Another thing to check is the position of the rocker arms. Infrequently one has been found laying on its side or completely separated from the valve train.
Make sure there are no plastic pieces wedged between the chain and the jackshaft and crankshaft sprockets.