Analysis of information sources in references of the Wikipedia article "Ultimate Fighting Championship" in English language version.
Then there were the rules changes, including no more head-butting, which negatively affected Coleman's talents. Wrestlers once dominated the sport, because they would put opponents on the ground and pound them with hands and elbows. But as limitations on permissible striking areas increased in the late 1990s, the effectiveness of Coleman's "ground and pound" techniques decreased.
Suddenly, it wasn't as easy to "take a guy to the ground and pound the (bleep) out of him until he quits," he said.
"When they took out the head butt, it made the jujitsu game (a form of ground fighting) more effective. It completely changed the sport so for a while there, I was a little bit lost. As fast as I climbed to the top, I fell to the bottom just as fast."
...with WWE surviving the merger as a direct, wholly owned subsidiary of [TKO Group Holdings]