no kekkei genkai tag ...

he has DNA of kimimaro and sakon/ukon

and he c*e shikotsumyaku, which its kimimaro's kekkei genkai

even kishimoto stated that he has integrated kimimaro's DNA within himself and could use his kekkei genkai

he also got jugo's DNA and got his kekkei genkai, it allows him to collect natural energy even if he is moving

there is just no reason for not giving him a blood limit tag