He can and I feel the main reason kakashi has low reserves is because he had to give the guy a weakness you kno? He has the sharingan, he uses it better than the uchias (3 tomoe), he has a variet of jutsus, he moves well, he is extremely intelligent, can open up 2 of the gates, he is one of the most balanced characters in the series, if he had huge chakra reserves he would be unstoppable (almost). Lol