Alright fine, perhaps the Shisui part was harsh but Madara never had anyone lend him power. He had a goal and went and made it happen.Fair enough! I can agree with this. except for shishu part lol... Shishu knew Itachi would not use them for evil so he entrusted them to itachi. It is also not like Itachi used the eye
Not everyone is lucky to be born with power and regardless of how much one trains, they will always be weaker than those blessed with certain qualities at birth.
That's why Madara went and obtained power he couldn't achieve through training.