Finally, Well known Vanilla bug has been solved. Alduin really approaches to land on word wall.
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Alduin not approaching to word wall while doing the Main Quest, Alduin's Bane, is game breaking glitch which leads player not be able to proceed the Main Quest further.
This bothered me very much so I began working to solve this matter. During testing, several variables were changed for alduin to approach to word wall. This variables were tested ingame, I watched probably more than 200 or 300 scenes; many failed but this helped me exclude non-working variables and finally lead me to find the actual solution.
Ancient Alduin (Alduin during cutscene) uses general patrol package to approach to word wall. This package can be interrupted by many variables.
Ancient Alduin now has a new patrol package which can not be interrupted until it perches on word wall.