Why did Ferid eat all of his allies? Is he stupid?
Hmm. Well, I have two answers for that.
1. Plot
Given that the final battle was approaching, and by logic, Guren couldn't remain standing cause the whole point was between the squad, they needed to take them down (Guren, Ferid, Mahiru, Shinya, the rest of Guren's squad, the progenitors). As for how I can tell, it all goes back to the very 1st chapter of the story
Including a bonus chapter:
Sooo, under that logic, it was clear this was bound to happen.
2. All or Nothing. Matter of strength
Ferid didn't stand a chance against the higher progenitors. He could caught off guard Rigr Stafford only once, however, in order to kill someone like him, he truthfully needed a plan. The best plan was to devour vampires in secret.
That was the only way to face high rank progenitors.
Ultimately it was a battle of all or nothing:
So the answer to this is no anon, Ferid wasn't dumb. They could have actually won but given that Yuu rescued Saito at last minute, their golden opportunity faded.
