I think there is some confusion here. Edo was later renamed to Tokyo.
And like jepp pointed out; both have value, because both seated someone in power (Kyoto = Emperor, Edo/Tokyo = Shogunate). You wouldn't conquer the Romans without conquering Rome. Unless, of course, they gave up, but no one in power is just going to give it up when victory can easily be decided by a single battle.
Bookmarks