Kosonen:
wt believes in a second fulfillment of Math 24, 25.
Jesus said that the generation would only pass away after the end, aka armageddon. so: according to that angle, the marriage can only happen with the full bride up there. during the cleanup here on Earth. but ' wt also says, that
the generation of anointed dies and goes to heaven before The GT gets serious, Babylon tG is attacked, so they could get married anytime after. If the great crowd are the brides maids, that can only happen after Ar ma geddon, because wt teaches that the GC, comes out of the GT, which has not happened yet, so the Great Crows does not officially exist yet. their fudging that notwithstanding.
For these 2 reasons, wt has to conclude that the wedding is later rather then hurried.