Without Dan, it is doubtful that Bruce would have even been able to keep a school open. It is certain that 90% of his discoveries and conclusions would have died with him. Bruce and Dan worked for several years together developing many training methods that simply never got into the classes Dan taught. Bruce apparently felt that the students had not sufficiently mastered the material already presented. In some cases, Bruce himself did not feel the ideas were sufficiently refined to introduce into a class.
When Bruce died, Dan Inosanto was the only man who knew everything that Bruce had developed. Only Dan knew what Bruce was still working on, and what his goals were. It is our good fortune that Dan was there to record Bruce's work, continue it, and pass it on to future generations.
If Bruce is the father of Mixed Martial Arts, Dan Inosanto is the man who delivered the baby and gave it the nourishment it needed to survive.