Buff Knigths already

The problems with this theory:

Knights in their paired synergies already do well. Noble and Glacial Knights both do their jobs in Noble/Glacial Comps. Poppy does her job in Yordle.

So buffing the champions themselves would also buff those comps.

On the flip side, if you just buffed the synergy; They already do their jobs as a Synergy in other champs than their main. In Noble, Knights allow you to survive until round 5+ with just a (2) buff. In Glacials, Knights allow you to survive until the last round.

So the question isn't going to be, "what do you buff?"

The right question: What new Knight units do we need, that have offensive power, but don't synergize with other teams?

That's the only way you could correctly buff knights as a standalone.