I don't think Darkus got it that bad. Since theres barely any Ventus Bakugan in this set yet. And its not like all the other colors got it going on in this GI set.
Ventus has Rickety Bridge, Dull Flame, Golden Sword, Hawktor's Turf, etc. Darkus doesn't have a single Silver card, Pit of Despair is higher for Subterra and Twisted Cave doesn't really have Darkus as a highest boost either as it's tied with Haos. I really want to see just one card with Darkus as the HIGHEST boost.
A "Low Bridge" card is just 1 Gate without the Ventus Ability. And with the advent of Vilantor, the use of Rickety Bridge or any "Low Bridge" card is a double-edged sword. Theres 3 "Sword" cards, Gold has its highest boost in Ventus, Silver in Haos, and Copper for Sub Terra iirc. So Darkus wouldn't be the only one excluded. As far as the Bakugan are, they're pretty close to each other, except Darkus might just have a few more than Ventus does.