Yes, in the past that’s what I have done and its generally ok. Although check with whoever is running your event…
IIRC, a member from 400X even loaded for 400S in finals last year at worlds. i don’t see why this wouldn’t be allowed.
(Assuming the guy wearing a 400X shirt was from 400X)
As long as they follow <G3> so that they haven’t been at the field for another team at the same event.
The guy wearing the 400X shirt is named Alex. He is a friend from New Zealand who stepped in at the last minute to help 400S. He never was a member of the 400X drive team. He just liked the shirt.
Alright, thought so, thanks for clearing that up 