A Borg implant was pressing against 7of9's trocliear nerve, the doctor had no idea, how to remove the implant without severing the nerve. Kes used her powers, saving 7of9. Everything the doctor did after that point, wouldn't have been possible, without kes.

As Captain Janeway herself once said to seven of nine "as captain, I can't always be your friend"

And iral Vance on Discovery "I ask that you continue to do so, by putting the needs of the Federation, before the needs of your crew"

The original gang back together, would be good. But it would take some insane negotiations, to make that happen. And also, season 13, would have to be something truly special.