U said kashi fought longer when he had back up and also he was fight light. He had medical ninja heal, he had kurama at the point of his death, naruto later gave him kurama chakra, which he was using until obito transfer him to another dimension which he has enough chakra. Obito has been fighting sharing his chakra for 5 jichuriken and their bijus, he did not have anybody to heal him or anyone to replenish his chakra and fought against fight nation all together, he fought with naruto,kashi,bee, and gai, he neva got his chakra replenished. Kishi just wanted kakshi to be defeat obito which it is impossible, obito can use hashi cell, izanagi,he can summon do a lot uchiha summonings, he has nenega and many more skills , which don't know about and all kashi move we know. Pls care u̶̲̥̅̊я̲̅ facts b4 writing anything about obito.