I laugh at this comment, because you're clearly biased and we all know this. I don't agree that the Mrazeks aren't ready for seniors - they certainly have the power and speed to be competitive with a lot of teams. However, I wouldn't go so far as some in both the Jr Worlds FD pbp thread or here who think that they're going to be competitive for Worlds Top 10 in their first season unless there are some retirements that help clear the deck, so to speak. Even then...
There's still a lot of teams ahead of them - Canadanes, LajLag, LesGacs, FearGib, HawBak, GreenP, CarPon, LopBri, DemLeM, TurkVer, ReedAmbru, the Taschlers, KazRev - that's 13 teams right there, plus the other Jr teams who are moving up - LimQuan, BekHern, BashBeau (well, BashBeau won't be at Worlds if they don't move ahead of LesGacs immediately). Is top 15 at Worlds doable - oh, yes, presuming the Taschlers can earn 2 spots for Czechia next season. And, if Czechia only has 1 spot next season, I think it will go to the Taschlers, who would certainly earn 2 in 2024 if those retirements happen.