The central theme of the thread is if the factored distances required for dispatch also apply to the actual landing requirements. The wording of the operational regulations is not particularly clear, but in the EU it appears to be generally accepted that a factored distance based on actual landing conditions should be used.
I think it's pretty clear isn't it. If you re-plan in flight you need it. If you don't re-plan you already have it. The only time it isn't required is when abnormal or emergency factors are used.