A great case study opportunity. Unfortunately, it's hard to discuss competing routings without having the routings in front of your audience. You need to be able to point.
Nonetheless, there are a couple of macro points that jump out when you compare the Ross and Flynn drawings for YCC. I mention them only to spur further discussion about the two men's styles.
First, Ross used more of the property. The existing 5th, 13th and 14th Ross holes lie completely outside the perimeter of the Flynn routing.
Second, there appears to be a creek (with severe banks at points) that bisects the eastern half of the property. Ross ran holes parallel to the creek (see nos. 11, 14, 15). By contrast Flynn's holes on that side of the property are roughly perpendicular to Ross's. In fact, Flynn has 5 holes that cross the creek (see nos. 12, 13, 14, 15 and 16) while Ross has none. (Well, Ross's 15th does sort of. The creek is at the tee but not in play.)
Completely different (if not opposite approaches) to using the creek and it bordering slopes.
Third, similar differences appear in the way they dealt with (what appear to be) the severe contours in the NW quadrant. Ross runs his nos. 5, 6 and 7 roughly north/south. Flynn routes his holes in the same area (nos. 5, 6, 7) in the opposite direction, east/west. Again, Ross placed his holes parallel to slopes, finding high spots where he could. Flynn seems to put more holes "against the grain".
(Those of you who know the terrain may tell me I'm all wet. If so I will happily retract the above. To borrow from our secretary of defense, you make do with the information you have, not with the information you might wish to have.)
But based solely on the routings, my sense is that Ross built more holes along contour lines, while Flynn designed more holes across contour lines. There are areas in the YCC routings where that contrast jumps off the page.
I would love to visit YCC someday and dig deeper into this.
Bob