Bean came up with his plan (the Third Invasion) because he thought there was no ansible, so the invasion fleet would hit the formics just when they found out they had lost the Second Invasion. When he found out there was an ansible, if he’d had the slightest sense in his head, he should have realised that the formics therefore knew they lost the moment it happened, seventy years ago, and thus could have launched their own fleet just as long ago.
Will Wildman