More like absurdly slow. 50 combats with Gruntt so far today and I'm at 5% for the event girl from him. And she's only a green tier girl. They've changed it clearly since just this past summer. Used to be you could at least earn the girls from the bosses during events without dropping a ton of money on Kobans, now it's no longer the case, not even for lower tiered girls. It's horrible now.