If you kill the leader of a Might-Makes-Right/Evil Darwinist group, do you inherit their position? After all...

If you kill the leader of a Might-Makes-Right/Evil Darwinist group, do you inherit their position? After all, by their own rules, they were too weak to lead if you win.

Pic unrelated

Depends what they consider worthy of leadership.

Maybe they will see you as "too foreign" : they understand that a bear is strong but they'll never obey an animal.
A group that see itself as really superior to all other groups/species can just consider the last boss had an accident.
Sure, he was weak/stupid enough to let himself be killed by a [insert appropriate derogatory term] but that doesn't mean the [X] replaces the boss.
They'll sort it out among them. In the mean time, you are a potential trophy.

Maybe they will also consider it not a "true victory" if you killed the man in his sleep or through means they see as not linked with might/strength/ect...
In that scenario, you're not even a trophy : they'll zerg you while you brag about being the rightful new king.

Maybe social skills also play a role in what might is for them.
The previous boss was a peerless fighter, sure, but he also had the support and "friendship" of other good fighters that made it possible to extend his authority.
He didn't had their support because he kicked their asses in ritual combat : he understood politics and offered them something for their alliegeance.
The capabilities to sway someone to serve you by playing on his own interests, that's also a pretty useful evolutionnary trait and therefor part of might.

Maybe this goes further : the guy you killed ? He wasn't even a good fighter, just smart enough to draw battle plans, organized enough to keep everyone well supplied and politically-savy enough to keep infightings and intrigue to a minimum.
You ripped his head clean off ? Good for you. That makes you as useful and mighty as a leader than Grok, the Ogre mercenary that they pay with chickens to smash things.

Finally, even if you did the right thing by killing the leader yourself, in a situation they judge good enough to qualify as new boss, your victory only means the old boss had BECOME weak.
His subordinates, still young and strong, will test you soon enough.

Would a real life biker gang accept you as their leader if you killed the boss? No, because that makes no fucking sense.

Biker gangs aren't fucking tribal, what sort of comparison is this? They're just a bunch of fat old dudes that like bikes.

Don't ask where the money for the clubhouse comes from if you like being able to walk.

they go door to door selling cookie sand magazine subscriptions

That's a motorcycle club. A biker gang is a rather cult-like criminal organisation that occasionally rolls around on MC's because that's part of the brand image.

This image still fucking amazes me.

inb4 >tumblr it's off google you faggots

Isn't this the plot of that second Riddick film?

Yes