There have been questions from people as to why the Allied Seals weren't rolled into the Centurio, especially now with all the nations being one alliance(again). So far, to my knowledge, there has been no answer from SE regarding this. But the amount of weeks it would take to get them all doing just the daily hunts is insane. Take into account the probability of a hunt mark being killed before you can get there/know about it, 9/10 you are relying solely on the weekly+daily(which the fates are a pain to try and wait for).

If we could also buy with Poetics, that would definitely be easier to do....especially since Poetics are so easy to come by now.