They all contributed in some way. They all should have received the prize.
It is believed that science is an open collaborative effort, and more than other things it is. But there is fierce competition to get your name attached to ideas that are new and revolutionary. That is the human element.
This was a discovery we were getting closer and closer to as the technology to look at molecules increased.
Somebody was going to discover this soon.
The people who did were not geniuses like Einstein or Newton, they were highly intelligent and had the right training and interests and most importantly lucky timing.