Everyone had an idea of what they "wanted" to do. Alex Rowe wanted to destroy it, the Guild wanted to use it to destroy Anatoray and Disith, the combined fleet wanted to use it to save their countries.
But the show is a chess analogy (I'd figure that the Silvana is Black and the Guild White judging by their color schemes, no?), it's not just a matter of getting across the board (getting to the EXILE in this case), it's a matter of bringing the other side into checkmate and ending it once and for all. That requires a bit more work.