Wait...Lappi was a factory driver for Toyota. Suninen had one testing day before each event, and his Finland test was compromised because Ogier crashed the test car, so he had to use the same car as he was using for the rally.
I still think driving the new cars must be a bigger jump from R5's because the difference in speed is greater (R5's are almost as fast as old WRC's in certain conditions) and the proper usage of aero needs experience.