I get what you mean. He certainly had the skills to be a pretty good leader, and even his political ideology was not too bad.
But he never could have been a good Prime Minister, because he simply did not have the personality for it. His failure was in his desire to cling on to power at all costs and his complete willingness to sacrifice all his personal beliefs to that end. He couldn't be a good Prime Minister, because those qualities were core to who he is.
Thanks for sharing this though. He does speak very well on this subject.