Nobody will ever use the illegal headbutt as effectively as Holyfield. A good argument can be made he won three of his biggest fights with it, both Tyson fights and especially the Rahman fight. That one was stopped because of injury by an illegal headbutt and should have resulted in a dq loss for him. Instead, he got a TD victory even though Rahman really won more rounds.
Lennox the lion saw fit to punch evanders forehead in whilst the real deal launched an head first attack.