I agree with your statement 100% that white oak is close grained.
I am not convinced that the attachments in your Post#7 are an accurate portrayal of the 2 oaks.
The same goes for your latest link when scrolled to "1. Look at the Endgrain". I dont believe that the photo on the right is actually white oak. At least it does not look like any white oak I have ever used. All the white oak I have used has a much denser end grain pattern and Im sure this also accounts for a lot of the weight differential. Also note that the photos in the link showing the surface look to me to be plywood. When you plane, sand or whatever on red oak and then blow ot down, the open pores on the surface are very visable to the naked eye. Not so on white oak.
If you want a slick finish on red oak, you always have to use use a paste wood filler. Not so on white oak. My word recall at my age gets worse by the day. back in the late 1960's through the 70's, a popular technique on cabinet finishing was to fill the pores with a colored paste wood filler (usually a white or pink) and then finish over it with a clear coat. I cant recall the name of the technique. Anyway, it almost always was done with red oak due to the open and larger pores than most other cabinet woods. Never on white oak, thats for sure.
Tony B Retired woodworker, among other things.
"Strive for excellence and settle for completion" Tony B