Yes, but the USFSA has made it clear that placements at Nationals are no longer a guarantee of being named to an Olympic or World team (unfortunately, IMO). If someone has a terrific season but ends up 4th or lower at Nationals, I think there's every reason to believe that skater will replace one that happens to peak at Nats.
Yes, but body of work should now be inclusive. Karen's 4th place at Worlds. Mirai's medal at 4CCs. Ashley's finish at Worlds and WTT. And performances at Nationals. JGP performances, Challengers, & Senior Bs. These should all be taken into account. My response to your argument was that it won't have "everything to do with the GP." The GP will have something to do with it.