@The quinn changes you're looking into
I don't/never really played Quinn all that much, but one that thing confused me was the fact it's just QUINN, not Quinn and Valor, her faithful sidekick Skaarl.
Why don't you just give her a similar kit to Gnar/Jayce/Nidalee. Let Quinn have her own set of abilities and Give Valor his(or is Valor a girl?)
Quinn could be the more Ranged type and Valor can be the melee pecking people type. On release they had a similar thing but it wasn't done justice. Valor just went in and started spazzing out at people rapidly.
Also the ult when switching, get rid of that dumb "pick me up Val" and go back to being VALOR. Just like Kindred with wolf/lamb. It feels more like you play as Lamb with wolf just being there.
Duo-ish champs like these two need to be created into the same system gnar/jayce/nidalee have where transforming/switching gives you an entirely new playstyle and kit