Lol I had the mind to in include the human but decided to use Frieza anyway as it would be a good way to work out the details of the two new humans from that arc. The one that was in 21 joined the Z-fighters but serves as a Training partner/mentor to Goten, Trunks, Mai and Marron. As he wanted to keep his feet on the ground. Despite being as powerful as Goku and Vegeta while transformed, he rather stay home. The second one is in hiding as she's a known criminal by law. Her handle has that she's yet to kill anyone but this new power could prove harder to control for her. A number of trust issues that one. Plus during the event her will was overwhelmed by Cell then was eaten by 21. Don't think she'll work with 21 so easily.

The way I worked it was that while the soul-link drew out more power the soul itself grew equally. So as this soul mastered Goku's, Vegeta's, 18's and 21's power, the human soul resonated with them and matched that power. Including Majin 21, golden form, potential unleashed and ssblue. Just to be clear they don't have those transformations just the maximum power they produce.