Who did the road grand prix and the mountain series?

I did a little research of who does the GP and who does the Mountain series and how much crossover there is.  The stats seem to prove out that there is very little crossover.  A big percentage of the people who did one mountain race (nearly half!) did either Wachusett or Loon.  That makes sense since road runners would be more likely to do either of those since they were a championship.  The total amount of runners serious about BOTH series is only 20, and I went with those who did 3 or more of both series and that isn’t even half of the races in either.  I think any issues with one event conflicting with another impacts very few people.  Of course those people tend to be the most vocal (me included).

Full stats:
https://drive.google.com/file/d/1u2yi1bMzL1Y1l-R34byBrJ2hVvxxjaeH/view?usp=sharing

Stats
1134	Did one or more GP races			11.3%
357	Did one or more Mtn races			35.9%
128	Did at least one of each, so 11% of GP runners did a Mountain race and 35% of mountain runners did a GP race.
58 only did one Mountain race.  Almost all of those did either Wachusett (NE champs) or Loon (US champs).
26	Loon
19	Wachusett
7	Greylock
3	Pack
3	Sleepy
51 did only one Grand Prix race and 23 of those also only did one Mountain.
Serious about either series (anyone who did at least 3 of each)
20