Just give him "First Order allies gain +50 Defense and other allies gain half that amount" -- that's what every other generic Leader has, and it's literally the worst stat in the game to buff, so it would have absolutely no effect on the game/balance whatsoever.
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Kylo Ren nominally leads the entire First Order and doesn't have a leadership ability.
Obviously, but not officers. Hence the post.
There are lots of heroes that don't have lightsabers...but if a Jedi didn't have one, that information would be irrelevant.