[masraum]

I watched the video. It seemed that several of the formulas were based on the outer dimensions of the bearing. As you addressed, obviously, that's silly since the bearing isn't a hollow void, its only going to hold a little bit of grease compared to the volume that the outer dimensions make up.

My take from the video was "force it in until it starts coming out and then you're good."

If I'm doing brake work on a car and have to pull a hub with bearings, I'll clean and relube the bearings if I'm not replacing them, but if I'm pulling and replacing anything, I generally replace the old bearings too so the new bearings must be lubed.