I don't think you correctly responded when you said he didn't sell his losers either, and claimed IBM was one.
1. He does sell losers (loser meaning bad investment, not just that the stock price went down for a few years). He sold COP, and said it'd been a bad purchase.
2. Buffett doesn't think IBM is a "loser". I suspect the long-term will prove him right, and your declaration short-sighted. Only time will tell, but your explanations of your reasoning, and linked article don't give me much confidence in your thesis. Just because the stock price has gone down for a few years doesn't mean it's a loser. The business is performing about as he expected when he bought with no surprises (his words on video). He's happy with the business performance, and has bought more stock this year. He has stated in numerous interviews that he's happy with their stock repurchases. He was aware when he bought that revenues would decline.
3. "I suspect Mr. Buffett is more the face of Bershire than the active manager of the past." Interesting, and weird, theory. This is so out there, I can't quite get my mind around it. Buffett has stated several times in recent interviews that particular larger purchases were his doing, and several medium-size investments were done by either Ted or Todd. They've made public exactly how much money Ted & Todd are running for Berkshire. So, basically you think he's lying when he says a particular big purchase was his doing? And, you think Ted & Todd (or some un-named other person) is running more money than Buffett & Berkshire has publicly stated? Quite the theory.
All the best to you.