My thought are no seniors should play jv. But with a few exceptions
1 is if you need the numbers to have a jv team
2 is if you have a underclassman in a key position and the back up is a senior and you want to get him some game experience.
Here is a Question why have Under Armor and Nike not made a face shield for a helmet they make them for the eyes how hard would it be for them to make them for the whole face mask.