from 690 , we can confirm that it takes hamura and hagoromo to seal kaguya together ..which might imply that they each possessed one kind of seal(hamura:half moon ; hagoromo full moon) , just like nardo and sauce. afterwards , the latter somehow gained the other seal's power .
Sasuke never demonstrated his moon seal to the full extent because :
1.the half moon power was never fully transferred to hagoromo
2(less likely).hagoromo doesn't know the full extent of its power due to not being the original owner , so naturally sasuke didn't either
3. both 1 and 2
4.that's the full power . it's just that weak and useless
opinion ?
Sasuke never demonstrated his moon seal to the full extent because :
1.the half moon power was never fully transferred to hagoromo
2(less likely).hagoromo doesn't know the full extent of its power due to not being the original owner , so naturally sasuke didn't either
3. both 1 and 2
4.that's the full power . it's just that weak and useless
opinion ?