The... synthesis? What? That's against the core principle of the Legion, and then some. Caesar explicitly wants his society not to change, not to prosper, not to ''evolve'', for lack of a better word, in short not to take anything from the nations it conquers. He does not want anything the NCR has; they are an enemy to be crushed, whatever he claims. If he has completely absorbed benign tribes, his treatment of the NCR will be probably worse, since they are far more educated and prosperous than any tribe, and so more full of sedicious ideas and cultural identities. Imagine if he takes Shady Sands? Since the Legion kill all male adults (AKA at the very least half of those that are educated) and treats the females like vermin barely fit to speak (AKA the other half), I fail to see how any kind of ''synthesis'' could be done. Sallow's grasp of Hegelian dialectics (the errors of this particular doctrine notwhistanding) is flawed; for one thing, Hegels didn't anticipate the concept of total warfare like the Legion does. For a synthesis to happen, the victor must absorb and accept the defeated to a degree, not destroy it utterly, as the Legion does and has seemingly no intention of stopping to do. See their treatment of Vegas if they win. Especially if Lanius is the new Caesar and Sallow's already shaky philosophical justifications go away.