good point, I should say from system view, their content have not started at the moment so their status couldn't be changed(buff) by other players^^
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My guess is that it has to do with the way pets and chocobo companions are sort of members of the party and sort of not. They'll appear on the party list for the person who summoned them, but not on other members' party lists. Stoneskin is applied directly to a specified target, so that wouldn't matter. Protect applies to any members of your party who are near you. Apparently the piece of code deciding who qualifies doesn't consider them full members of the party. (As I said, though, that's just my guess.)