I'd say suggesting as many copies of Kunai here is actually justified, even if it's rather unlikely. It's clearly a VERY powerful card here (both a defensive tool and an equip for Cocoon). These decks are just examples to build off anyway.
The preliminary decklist early on included 3 copies of Kunai with Chain. It's changed since then. (Also, the next-newest post in this particular set of comments was a month ago, did you really think nothing could have changed in that time?)