I don't thing teacher will be a right advisor. He's too naive for that. His value in life is biased. He thinks like the peaceful era, not the chaotic apocalypse setting.
To be fair I did say maybe, but I have so much doubt for the teacher it's not funny. But Guwon does need a person(s) to bounce ideas and such off of. I would say a council or leave up to group vote. But the problem is most of the adults are 5 seconds away from planning a coup. On top of all this if i remember the teacher was fresh out of college before the zombies. So it makes sense he's easily swayed, and he also is harden yet but I'm assuming in later chapters that he may change or experience something.
I think what Guwon needs is an advisor. Do I think the teacher would be a fit, maybe. But one- he's on the wrong side. He needs to realize that Guwon is making decisions on his own. He can't bounce ideas off someone in that survival camp because everyone is plotting against him.
Two- Guwon literally saved and vouched for the teacher in the earlier chapters many people questioned why the teacher was even around and doing anything despite the teacher being heavily injured.
Three- despite Guwon looking the way he is and having the iq of a half eaten baked potato. But he is human, no one really 100% knows what he's like before the zombies. However he's human at the end of civilization and doing the best he can with what he has. If it means limiting medical supplies, because there's a limited supply is completely understandable.
In my opinion- the teacher needs to realize that things are different but there's still the same aspects, especially when one person is a leader and there's people gunning for his place. There's two sides to this and going with the people who literally questioned the reason why you're there and still alive is not your friends.