No.

The number of people on the point matters when capturing it (capped at 3 people for maximum cap speed), but once you own the point, the percentage meter fills up at a static rate regardless of team presence.

Video proof to follow pending my return from work.

No.

The number of people on the point matters when capturing it (capped at 3 people for maximum cap speed), but once you own the point, the percentage meter fills up at a static rate regardless of team presence.

I have video proof that I can't upload currently. Before I do, I'll probably edit them together to give a side by side view.