To be fair Jiraiya's barrier should adapt to the breakthrough change nonetheless; it's not like Hashirama will change his breakthrough mid-battle to his barrier mystery. So since Hashirama FH's Y is a non-barrier mystery and none of Hashirama's other skills let him disrupt or create barriers Hashirama should be able to cast his mystery under Jiraiya's type of barrier. Same thing with any other barrier that "could" do something but won't in a battle because the actual skills aren't actually set for that ninja to use in that battle. Otherwise characters will keep randomly getting blocked from doing things that they wouldn't be able to do anyway in a battle to start with. Which could be confusing for some and irksome for others.Or both.