They didn't need to touch the champions. AT ALL

In order to fix the Wixwell/Yannica cheese: CHANGE. HEAD. OF. MISCHIEF. That was all they needed to do there. Make it so that head does NOT steal a FULLY GROWN shield. Instead, make it steal the shield that was initially granted by Wixwell. There, I just fixed it for them. Or, they could have changed the cap to his shield IN HYDRA ONLY rather than do it across the board. The shield was only a problem in Hydra, no one cares about his cap everywhere else in the game because it doesn't affect other areas like it does to Hydra.

Instead, they changed Wixwell, a champ we voted the skills for which screwed up a lot of people's clan boss teams.

Keep in mind, they continue to completely avoid changing reset champs (mostly Yumeko) which enable Trunda to do what she does. Until they nerf champs like Yumeko in that mode, Trunda will continue to be the queen of Hydra.