Maybe why Mallow dithered about entering the league compared to the others.
It is kind of annoying that, assuming this isn't an April Fools summary list, that they seem to be stuffing in this frantic 'crash course' in the last twenty or so episodes before the league, it kinda reminds of the Whirl Cup in Johto, realising they didn't do anything with the companions and just quickly trying to stuff something big and noteworthy in.
I mean I didn't even mind Ultra Adventures, it shown they could do fun fillers, and I enjoyed it way more than the formulaic first half of XYZ where I was more or less begging to just get to Team Flare already, even with the latter having way more change ups, but surely they could have paced some of this earlier on into UA to make it more eventful and to develop on dynamics a little earlier on. I mean Mallow and Lana barely got anything to do the whole second season and now they're making a mad dash to give them anything. Surely Lana could have gotten Nagisa a couple months earlier (we would have known what it was promoting by that time) and done a bit of build up battling in all that time, not just to help with Ultra Legends pacing but to give her more of a consistent presence the entire series.