Mainly because Necrovalley doesn't have a reliable searcher.
Which is because Darklords just got a new mainbox UR card that greatly helps them. A lot of players will be pissed off if Darklords got nerfed to the ground just a month after getting that mainbox UR card.
I don't think Commandant will be UR, it's more of an SR card. I can see it being a minibox SR though.
Minibox so that you need to reset 3 times for it. Resetting a minibox 3 times, assuming fully opened box, takes more packs than resetting a mainbox 2 times (remember that mainbox SR only need 2 resets for 3 copies, unlike minibox SR).