Hello there, I am blessed with Managarmr and Belial, but no 140% yet, and I have not Mtix for Anubis since there is no light event recently.
So far within this month, I have traded 16 Guardians weapon, 4 for wind and water, the rest 2 each. I could see the argument to go for max amount, but that would be kinda too much, since I am New and have not unlock Shingen, it would be easier after Shingen. I do have the resources to trade for the 3rd weapons, but decide rather not and just save for next reset.
Another reason is my Hundo is fire and light, which after I read a lot from this thread, does not have a really viable Guardian weapon options, only exceed and assault which 2-3 Max due to cap.