User blog comment:Hitsuji Mamoru/Yamazaki Susumu/@comment-31760473-20190718183545/@comment-4802891-20190719093802

lol If I weren't following the schedule of the game, maybe he would have been a bronze... I guess. It's still very hard to balance a bronze Servant. If he was his skills would have higher cooldown, would but much weaker in effect, and his NP would just be him increasing his star generation rate, so he would have been a pretty weak fellow all things considered. I think I made the good decision raising his rarity a notch^^

I don't know anything about the Dekoboko thing, I just did that because I saw the comment on Yamazaki being the "most loved of Isami" on Japanese sites and here I was, making him a trap with objectives.