Comments of chapter undefined of In Douluo Dalu with the Naruto System

Finaly 4th ring. I wonder which "ninjutsu" will be. If we are looking stictly only in the "ninjutsu" category then I would chose either chicory/rasengan or raikiri. By the way why is the mc so tired? While itachi, sasuke and kakashi had big problems with using mangekyo sharingan, there was not one and I mean NOT ONE person that had any problems with EMS. Madara, Obito, sasauke(ems), kakashi(ems), Indra, etc. NO ONE that has EMS had any problems in using it. Also while it is true that the sharingan uses mental (yin) strength that is STILL a part of the chakra. Meaning mental (yin) strength is still replenished the same way as chakra. Threw chakra regeneration. Given that in this story chakra is replaced with spirit energy then logically mental power should also replenish threw spirit energy regeneration. Given that our guy is basically the jinchuriki of the ten tails(all 9 tails combined) I don't think he should have any problem in using ems for long periods of time.