His distrust is justified to a certain degree, you can be betrayed by a summoner, just like anyone else but on top of that, the summoner could be betrayed by the summoned beast and put everybody else around at risk. You can't compare a sword, bow or any other weapon to living creatures (either...
Wish the author just spared us of the supernatural crap. He could just have made shin go into a coma for a couple of chapters of something and make kyoukai a potato cripple due to the beating she got from Houken. I just don't see the point of introducing magical revival crap unless the author's...
I will never understand why people make such a big deal out of sniping. Just release your shit anyways and if your work is superior, people who appreciate said effort will wait for you.