The Coliseum Armour Set and Super Stash Sale

It's an impressive piece of work, to be sure... however, I for one wonder how come so few of these armor sets have complementary shield skins, and in the cases of those that do (Stormcaller and Carnage come to mind) why the shield skin (along with the backpack/clock as relevant) aren't part of the discount bundle.

Please do super stash sale again, we missed and we are waiting for it :/