That's fair and I certainly felt like the case for lightning rod was a lot shakier than for gatekeeper. It's hard to make a clear cut distinction as to what that role would completely entail since people don't restrict themselves to using the the term for high MR units like Odette or Sophie. And frankly, I never felt entirely comfortable trying to restrict the term to only magic resistant units in the first place given that high rarity vampire hunters are roughly as bulky (or bulkier, in the case of Fran) as gold soldiers and can flat out solo a lot of ranged monsters if need be.