You might remember that I had to do this last year and took some heat (here) for pre-recording it. However, it worked perfectly.
Record it, line them up and let it roll.
Doing that is like hoping for good weather when planning an outdoor wedding. If the weather cooperates great, if it doesn't you're screwed. Same with the bridal party. If they are late/early your intros turn into a horrific nightmare from which there is no waking...LOL Too dramatic? You are right 99% of the time that would work and glad it did in your case as well