Sounds like that could be a really convenient partnership.
I have a wedding planner, and she comes with the package, lover her so far. All is done by email, easy enough for us.
My aunt is taking care of guests travel, as she works for Carnival, who we are cruising with.
If it makes you feel more at ease to have an extra link, then go for it. There is a lot of planning involved and lot's of details to oversee.
Good luck!