[@ReaptheMusic] Well the problem is all seven share one mind, so they can't actually fight and block and combat as individuals. Thus he use's them as a sort of fast attack combo, however if one is destroyed, well then his aura is quite weakened. Sort of like how Blake can escape her target, his lets him strike multiple times in one blow, however seven targets is and all of them being lead by one brain would end poorly.

As for the thread he would require loads of practice to make some of the more impressive stuff, or a lot of time. It's why his semblance is so different from his weapon, one to strike and the other to defend. Both have strong points however with they both do have a weakness, I can rework the seven in one if it is still overpowered. Changing the it would probably just do something like give him seven times the strength or something like that.