Prior to this, everyone had a consensus that in a skeleton squad, the unique one must be the captain.
It wasn't a mistake as everyone had already proved this point. Once this unique individual was identified and taken out, the whole skeleton squad would lose its teamwork and become scattered and chaotic.
From a certain perspective, they felt that the average intellect of the skeleton squad wasn't that high and the only intelligent one would the leader who also gave the orders, resulting in a highly operative squad.
Someone previously said that the skeleton must have lost his spear and everyone else thought that it was hilarious, how could that be possible? We're talking about a skeleton and a combat weapon. If you said that a human being lost an eraser or a pen, it would be believable but a skeleton losing a weapon was too ridiculous!
But the truth was… it was really lost! Wait, no, someone took it!