Saw Duginske do something I had started to wonder about when I was
jointing some rough, cupped stock.

I had started to wonder why I was face jointing the stock completely
flat. Wondered if I was able to establish flat spots on both sides,
the complete length of the board, if a couple of light passes on the
planer would help.

http://www.taunton.com/store/pages/061011.asp

I'm going to finish my personal experiment with this tonight - having
jointed a couple of white oak and maple test pieces.

I'd suspect you'd have to take light passes on the planer as to not
compress the stock.