Geniune question regarding Copy's consumption condition

during the final fight, many parts of sukuna were cut off and flying around, tongue and arm (I'd say even though not very vital, they are still valuable to sukuna as it allowed for chanting and extra handsigns), he couldve tossed one into Rika to chew on while they are fighting, giving him a stronger cleave/dismantle than the one he got from Yuji's fingers