Hmmn...I don't necessarily agree with your assertion on the numbers. Yes one of the Gifters did say something along the lines of Hacha not being able to become a member of flying six but I don't think the reason is necessarily because he isn't strong enough to become one but rather because the Numbers lack any semblance of human level intelligence and are difficult to control. For example, from Kaidou's talk with the Flying Six, it seems as tho he usually sends them on missions, the latest being yamato's retrieval, which if you think about it, would be impossible for a Number to accomplish for example. I do think they could be just as strong as the Tobi Roppo as even Queen alluded to them being difficult to control. Moreover we had one number make both Inu and Neko like children 20 years ago, so they are most likely very strong. Yes Inu and Neko were considerably weaker than now at the time but they were cream of the crop elite wano samurai regardless. Other than that, nice complication and thread ^^.