Help me understand a bit if you could. I'm taking from this that once you compete at the Sr Level with in the USFSA, you are no longer able to compete as a Jr here, but can compete as a Jr within the ISU.
Yes, IF you are still age eligible.
Junior is an age group in ISU competition.
It's a test level in the US.
There's a lot of overlap in the skaters involved, but what qualifies them to enter junior (or senior) competitions is different for international and US events.
I assume also that once you move to Srs internationally you can't go back either.
Not true. As long as you still meet the junior age requirements, you can compete at senior worlds, senior Grand Prix, Olympics, etc., and then compete at Junior Worlds. I can find you plenty of examples of skaters who have done so.
I think the only restriction is that after you win a
senior world medal you're not allowed to compete in ISU junior events.
Also - how different are the requirements for the Jr. Men vs Sr. Men? I know it's 30 seconds shorter for Jrs
I know Sr is 13 elements, - 8 jumping passes, 3 spins and 2 step sequences - iirc
Junior
long program is the same as the senior with one less element. Junior men don't get a second (choreo) step sequence, and junior ladies don't get a spiral sequence.
Junior
short program does not allow quads and does allow double jump as the solo jump out of steps (specified as lutz, flip, or loop each year) and does allow double-double combination.
Senior ladies can now do triple axel as the solo axel, but junior ladies still must do double axel.
The flying spin, and the change-foot spin for men, are specified as either camel or sit position each year.
Finally, are PCS scores theoretically transferable from Jrs. to Srs. - ie if a Jr skater gets 5.5 in transitions, he would probably get 5.5 for the same skate in Srs.
No more or less comparable than any two different competitions with different performances and different judging panels.
But remember that the junior long program is 30 seconds shorter. If cutting out 30 seconds means cutting out transitions, that might result in a lower transitions score.
Looked at the other way, if adding 30 seconds for the senior program includes adding more transitional moves, that would likely result in a higher transitions score.
I guess what I'm getting at is - can you look at Sr. protocol sheets and extrapolate an approximate score if they had skated in Jrs.?
You can make a rough guess. Subtract the points for the choreo sequence from the long program.
If the short program elements are different to meet the junior requirements, take those differences into account.
But the GOEs and the PCS are going to vary depending on how well the skater performs at each competition and how generous or stingy that particular judging panel tends to be with the marks. Just like comparing two different competitions at the same level, you can't expect the scores to be identical for the same technical content.