I fully accept the "It's the Executor" explanation exept for ONE detail. That's the direction. The bridge tower, while mostly moving straight, is moving ever so right-left in the frame. Then, we see the SD moving generally right-left. Then we see the Executor moving left-right. It's sudden and jarring (if it's the Executor). If the first shot was intended to be Executor, then it ought to be flipped horizontally to preserve the flow of motion.

EDIT:
Here's a visual explanation of everything I just said: