
What?? No! obviously he wasn't the one who sent the letter to little A! He didn't even know he was there!
Seems like after years of the psychological torment in watching people being turned into livestock and treated like... well... animals, he became unstable, but when he realized HE was trarting to turn as well-...! I suppose that was the straw that broke the camels back.
He just ran away, as far as he could (as we can see in ch12) not even stopping to think of the consequences and meaning of his disappearance, just figuring they'd find someone to replace him.
But once he hears little A is the replacement, he's going to come back and beg him to escape with him before he starts turning too, (which Lil A is going to refuse because he's come to care for these PEOPLE, not livestock, PEOPLE).
Anyway, this just seems obvious to me, dunno how you didn't see it yourself, op.

I think you’re right that someone else sent that letter…or he sent it before the change happened, and now is blindsided by the fact Little A actually came?
I still find it a bit weird that after all this time A was still in the same town (the bus driver is the same as chap 1). I guess I don’t know enough about A’s motives to tell.
What type of hybrid do you think they are?
And of course Little A is going to refuse to leave haha
Thank you for your insight!
So maybe A ran away because he was noticing the changes in himself; and tried to get little A to take over because if people knew he was a hybrid, they’d take the farm away from him.
I wonder if he was looking for a drug to slowly reverse the effects or something?
He doesn’t seem the type to look away or be ok with people suffering.