With the large number of Ghouls that the CCG kills, one has to wonder what exactly the specifications are for deciding which ones get turned into a Quinque.
As a side note, it’s also important to mention is that Mado also suggested that better quinque apparently comes from ghouls who have activated their kagune, as opposed from those whose kagune is sealed.
However as mentioned Yamori was turned into a decent quinque even with his kagune gone (read: eaten by kaneki) so the quality of a quinque isn’t just down to the kagune being released. However this does mean that to make better quinque, Investigators like Mado actively try to rile their ghoul foes up to actually using their kagune.
Mado could also tell from sight that Touka’s kagune was of a high enough quality for quinque modification:
He’s either basing this on physical appearance or her strength which he noted during their fight, if indeed RC/kakuhou quality produces stronger ghouls.
Then there are also the knives that Juuzuo and Mutsuki use, which aren’t kept in a quinque case. It’s likely that these are made purely out of the quinque steel, not a kakuhou. Like the Q-bullets!
Relatable FE Quote or Something 