Legion's Power should be Scrapped Entirely.
When Legion's first cinematic came out, he was fleeing alongside David as if he were a survivor. They both take cover inside a building together as if they're friends, then Legion reveals his true identity and guts him.
I'm like "Wow, a killer who can disguise himself as a survivor! This character going to be so fun to play!"
Then Legion gets released and his power is...totally different. Different in a boring way. Not just for the killer, but for the survivors, too.
A stab. That's his power. He stabs things. And for survivors, that stab just adds another loading bar to a game that's primarily "hold M1 to win" anyways.
Nothing innovative, nothing exciting. Just a one dimensional melee attack. Yes it gives him wallhacks and move speed too, but how is that fun for survivors when stealth is a major element of staying alive in this game?
If that weren't bad enough, the number of limitations the Legion player has to deal with make his power painful to use.
"Okay we'll give you this power that lets you stab multiple survivors in quick succession, but you're not allowed to see blood stains, scratchmarks, miss a single melee attack, or down survivors while using it. Otherwise your power gets cancelled and you have to stare at the ground for 4 seconds and wait 20 seconds to use your power again."
That's a power? A power should feel powerful. That's just a melee attack with a bunch of conditions attached to it.
Honestly, I think his entire power should be scrapped. Loading bars aren't fun for survivors, and you can already stab things as Legion without his power, and they'll actually get downed if you Do stab them without it.