I play with the French version of the game which is very clear and could be translated as follow:

During phase 1 every player picks his card In the discard pile if possible. If so, every card discarded during his round will be thrown face-down on the draw pile

I play with the French version of the game which is very clear and could be translated as follow:

During phase 1 every player picks his card from the discard pile if it is possible. If so, every card discarded during his round will be put face-down on the draw pile

Translation from the original French card:

Durant sa phase 1, si c'est possible, chaque joueur pioche ses cartes dans la défausse. Si c'est le cas, toutes les cartes défaussées pendant son tour seront posées face cachée sur le paquet

I play with the French version of the game which is very clear and could be translated as follow:

During phase 1 every player picks his card In the discard pile if possible. If so, every card discarded during his round will be thrown face hidden on the draw pile.

Thus argument 1 is correct according to the FR rules.

I play with the French version of the game which is very clear and could be translated as follow:

During phase 1 every player picks his card In the discard pile if possible. If so, every card discarded during his round will be thrown face-down on the draw pile