*jumping in a little late, but what the heck*
I have always considered that the capacity of the Brace to care a load should not be considered when calculating spans, loads, etc, since the purpose of the braces is not to carry loads, but rather, to prevent the racking of the frame and stabilizng it against lateral loads.
On topic, I would splice the plate over the brace as directed in the above diagram if I have the choice, or over the post, as a second choice, if neccesary.
