Mike:
I wouldn't put too much stock in too much of the detail of what any of the red lines on that map look like, particularly blown up 5-10 times!
If the red lines are George Crump's and maybe 7-8 years ago I made that assumption/conclusion (including the blue lines being Harry Colt) for a variety of reasons I'd be glad to explain.
I should also add for historical clarity that map was not called "The Blue/red line" topo map by the club or anyone else. I named it that about eight years ago simply because it appeared at that time that noone had ever understood the difference or significance of the blue and red lines on that map or what they meant. I'm afraid the last PV history book writer might have mistakenly assumed everything on that map was done by Crump and even that he may've finished the map before March 1913----the actual surveyor's date on the map.
Crump may not have been much of a drawer and I doubt he'd ever previously tried to do golf architectural drawings so we shouldn't expect the same things from them as we might a professional architect who needed to be detailed with his drawings for crews and foremen when he was not there.
When that map was begun (arguably right around May/June 1913 during that one and only week Colt was at PV) that particular "blue/red line" map was definitely a work in progress that would progress for a number of years. I know that because there are various things drawn on that map that I know did not take place for some time to come. Actually trying to figure out how long Crump used it to draw on is an interesting investigation in itself. In that vein, he may not have put that much on it in late 1916 or 1917 because some of the things that had taken place at that time (ex. the final development conceptually and actually of the 14th hole) do not really show very well or in detail on that map. There is probably a logical reason for that----eg America's entry into WW1 and the lose of crews and the virtual shutting down of PV's construction until the war was over and Americans came home---unfortunately after Crump died.
The other thing viewers of that map and PV's course's long-going development and creation should remember is the way Crump worked at Pine Valley---eg he was basically there most all the time with his pro/foreman Jim Govan so it wasn't as if either of them needed to perfect that map and the details of the drawing on it to such an extent that it could be interpreted by someone else without either of them around. In other words, generally both of them were there to just show the crews what they wanted to do even if it may've departed on the ground from what Crump put on his map. Most of the early years there were only two abodes on that property---Crump's bungalow and the Govan family's next to the 2nd hole. Govan was there all the time---it was his job, and apparently Crump left fairly infrequently.
I do not think it would be too much to say that in the annals of golf architectural projects, and perhaps anywhere in the world, Crump's life and his experience there at PV was more of a sort of "Waldon Pond" thing than anyone else like him had ever done before or since and by a considerable factor to boot.
Hope that helps you interpret that map compared to what got on the ground architecturally when George Crump was there. And in that vein, when studying the details of that map it sure does help to be intimately familiar with not just all the little architectural details of the course itself today but particularly the details of how it got built and the way it was in Crump's time, and shortly thereafter.