Kamala is the Senate tie-breaker in the current 50-50 Senate...
If the 25th is used to force Biden out, then Kamala takes his position as Acting Resident...
At that point, there will no longer be a Senate tiebreaker, and Mitch McConnell gets to effectively block anything he wants - even the appointment of a new Vice Resident...
That is an angle that would be interesting. Could be the start of going after Obama.