He doesn't seem to be that knowledgeable I doubt Hagler would stop Hopkins and Monzon both of whom have never been stopped.
I listen to his stuff on youtube all the time, he knows his boxing. Fans send him in letters asking him about upcoming fights as well as mythical fights quite a lot. If you type in `boxing info` in youtube, you will get a lot of his clips. For eg. I typed in `Duran v Armstrong boxing info` & it came up, he had actually been asked that question. He`s done other topics like `top 5 mexican boxers ever`... the clips are usually from about 3-10 mins long, some interesting questions answered by a guy who has a real interest in the sport. Obviously Ive disagreed with some predictions of his but we all have different opinions. :good