doubleofive said:

The problem without the scout walkers is that they appear for two shots and disappear in the next. The one that passes by Luke should be seen in the next shot of his POV of the walker he just blew up. For continuity's sake, it's better to have none than two disappearing ones in my opinion.

Here's an idea. Why don't we just move the first shot of the ATST from earlier in the battle to the end? Like at the point where you see the rebel ground troops fleeing just before Luke destroys that single AT-AT by himself. You can establish the ATST somewhere during the rebels retreat, and after Luke destroys the AT-AT, you see it again.