We don't need to send people to a lost objective, we're needing reinforcements at the library and palace. Once that worm shows up to eat all the jedi we are going to need all the help we can get.
and in answer to they coordination they had planning for the invasion since day one of empress teta. Knew it was coming and worked to go from there, didn't know the objectives until less then a week ago but knew it wasn't going to be pure pvp... also they have synergy usually. That they broke up the original idea of having the kaiju and worm attack the medical center is a lucky thing cause two giant monsters would really have made it fast.
The Republic has its coordination as well but we also have the burden of being attacked by the remnants of the sith empire, some of the order and ones who have been working in the one sith to improve themselves. They still have ones like Kaine, Arcis, Faust who haven't appeared but will know exactly where they need to go.