Every donut I've seen are designed to protect the head tube. Never seen them on bare cables half-way down the down tube. What's to keep them from sliding all the way down to the bottom bracket?

update: Called the Pinarello shop in Irvine and the mechanic said that derailleur cables on carbon Pinarellos should not be crossed. Scheduled to take the bike in on Friday and he said I could wait until he re-routes the cables and adjusts the FD/RD trim.