It used to be said that content should be as high up the page source code as possible. So javascript menus for example, which took up a lot of code lines, were frowned upon.
Is the mantra still content as high as possible?
Because I note:
1) pages doing ok in the serps with quite a bit of code above the contents.
2) that google certainly does read all of the page, because that is what it stores in its cache.
3) Might google itself value data at the top of the page more?
4) I have not seen many examples of the blank table cell in use today.