The big problem I just discovered and my own stupidity for not seeing it
The Blue have been discovered after the Bridge was built. The Bridge was built as mean to reach Andromeda in order to eliminate the Y'All problem once and for all.That was after the war. The Bridge was completed around 3600
The war ended in 3599. So they could not have brokered the peace at least not for that war.
I have to rework that to make it fit.
Sorry about that