I’ve been thinking, when Finn and Jannah deactivate the tower on the Finalizer, Poe immediately says “nav signal’s down, but not for long” which indicates that they know the “nav-signal” is going to come back soon, and he would only be able to know that if the same were true for the tower on the ground - which was their initial plan. This makes sense, because if they were able to stop the ships from deploying for good, then why would they need Lando & Company to help? It seems like the plan was always to delay the takeoff long enough for help to come and destroy the ships.
So… is there a way to make that clear in the movie itself?