The Davis part was like 1% of the point of that whole post. I am sorry that is all you chose to focus on. I think its an inaccurate statement to boot. I doubt the RNC has ever had to fund and incumbent's primary race. The whole point of being an incumbent is that you can raise your own funds.
2) The point of the Siljander/Upton comment was that the NRCC funded a primary challenge by Upton against a seated Republican congressman, Siljander. This is one reason why I would never give money to the NRCC.