i don't think you quite understand Seagals background. this guy was one of the few if only white americans to actually teach in japan. do you know how good you have to be for japanese guys to take a white guy seriously, to teach in their home country. years ago, when seagal would hold seminars, guys from around the world would come to see him. regardless of what you think of his movies(in my opinion, some of the best action movies ever made) he is one of the highest ranked aikido practitioners in the world. watch some of his videos when he was in japan teaching. how smooth and explosive he is.
Do you really think machida and silva need a near 60 yr old, no longer making prime time movies, except for Machete, that was a main movie. do you really think those world class fighters need him for anything to appeal to america. get real dude. if that was the case, he would just come at the night of their fight and walk down the isle with them. instead he flies down to them spends days with them training with them. do you really think Silva would bow to seagal and call him Sensai if he didn't take him serious. machida and silva are very proud men, they don't need him or anyone else for some gimick.