Well, week 3 of Battle Roads saw some balancing (Darkrai still owned).
Darkrai 16 Battle Roads (after 30 in 2 weeks)
Zeels took 7 (up from 9 after only 2 weeks)
CMT took 4 (up from 4 after only 2 weeks)
Mono-Fighting pick up 1 (after 5 in 2 weeks)
Troll variants picked up 4 (though I think they just hadn't yet added them previously)
So Darkrai didn't really slow down, but the other tier 1-1.5 decks picked up some speed. I expect a stronger showing out of non-Darkrai decks in week 4 as well.