The epitome of what it means to be a martial artist, Lyoto Machida is well versed in combat sports. A black belt in Brazilian jiu-jitsu, a third-degree black belt in karate as well as experience in sumo, any fighter would be wise to learn from Machida. His style might not be able to be recreated by anyone not from the Machida family tree, but Machida's experience in multiple arts could provide a wealth of knowledge to perspective students.
You'll notice that Rashad Evans is regularly in the corner of fighters who are from the Blackzilians camp. Evans has done it all in the UFC by winning The Ultimate Fighter (as a heavyweight), becoming UFC champion and helping to build the Blackzilians from the ground up. And as everyone knows, Suga doesn't have an issue with speaking his mind. Whether it's coaching or in a broadcast role, Evans has a lengthy career in MMA ahead of him.
The Canadian superstar has stepped away from the cage for a leave of absence, but Firas Zahabi has assured fans that GSP will be back. With his knowledge from training under Zahabi and Greg Jackson, along with his strategic mindset, one would assume Georges St-Pierre wouldn't struggle in a coaching role. However, great fighters do not always make great coaches, and if GSP and the UFC can mend the fences, I would expect St-Pierre to enjoy an executive role with promoting the UFC/MMA in Canada.
The Warmaster has already made a move into coaching fighters, including current UFC women's bantamweight competitor Shayna Baszler. Learning from one of the greatest coaches in Erik Paulson, Josh Barnett has a great mentor to call on if he needs future help in coaching. He's also been around the sport for years which would provide a great deal of knowledge to pass on to the future of the sport. That is, if they enjoy heavy metal and conquering the world.
The brash fighter is one of the best trash talkers in the game today. After initially beginning his career as somewhat of a fan favorite, Michael Bisping has long been on everyone's list of "most disliked fighters" for much of his career. Still, Bisping has enjoyed a great deal of success despite not winning UFC gold (at the moment). The Englishman has made appearances on UFC on Fox broadcasts regularly and would likely become a major focal point of helping the UFC's expansion into the European market.
The Nogueira Brothers
The talented pair of Brazilian brothers already own a gym and many of Brazil's top fighters have trained under the Nogueiras. The two men are legends in MMA and are universally loved by fans everywhere. That name value combined with their experience make me believe they'll have a great career at coaching once they decide to retire. They've shown that they can help produce world class talent even with their own full schedules, imagine what they can do when all their focus is on their students.