Logic Games question for games with game pieces appearing more than once

grant.ashley114

https://7sage.com/lesson/sequencing-game-wa-twist-3-game-board-setup-1/?ss_completed_lesson=1115

Approximately 9:40 into the video, J.Y. says that a game piece that is the sufficient condition cannot be the item that goes twice because it would set up the necessary condition twice, which cannot occur in the context of the game.

I am confused why G or J can’t be in paired in the last group and cannot be the item that goes twice.
I recall in another lesson J.Y. saying in logic games where items can be used more than once, if an item is already triggered and satisfied, then that item can be used and isn’t constrained by it’s conditional relationship.

Does this sounds familiar to anyone or am I confused?