yes, this girl was so strong that she was actually able to fight off Yama with all his upgrades, yama has both doom and yasratcha's fangs and was so strong as shown, that puts her in a much higher position than Mascheny who couldn't even overpower Jinsung who is < Kallavan < Yasratcha < Current Yama
Jinsung, Kallavan and Yas are all around the CC Tier. Probably not much use in ranking them from weakest to strongest, since compatibility would be the biggest factor in determining the winner.
Kallavan is for sure not weaker than Yas. SIU said on a 1v1, Kallavan would have a slight advantage. If Jinsung is weaker than Kallavan, it isn't by as much as the fight could suggest. He had a bad match-up against Kallavan and is confirmed to be capable of easily defeating people Kallavan would struggle with (compatibility). He was also said to be capable of fighting Corps Commanders on his own, so there's that.
That aside, I agree current Yama should be stronger than them, and that the lightning girl shits on Maschenny feat-wise. Hell, even Holand has better feats than her at this point.
and I hope Urek goes at least 50% against boss/zahard (in 100% I believe he is even stronger than King Zahard)
He most likely would go beyond 30% Reinforcement, yeah. 50% can be a good guess.