Who's the Greatest Mixed Martial Artist ever?
A Discussion- Part One

Candidate: Al Iaquinta
Upside: 14-0 as an amateur, eight of fourteen pro wins by stoppage
Downside: Half of his professional losses (three of six) by submission

Candidate: Dan Hooker
Upside: Seventeen of twenty pro wins by stoppage, including seven by submission; five of eight losses by decision
Downside: Two losses by submission

Candidate: Paul Felder
Upside: 17-5 as a pro; three of four decision losses were split decisions
Downside: Just one submission win

Candidate: Edson Barboza
Upside: Thirteen of twenty wins by stoppage (seven TKO, five KO, one submission)
Downside: Five of nine losses by stoppage

Candidate: Justin Gaethje
Upside: 22-2; stopped Tony Ferguson's twelve-fight win streak
Downside: Both of his losses by stoppage (TKO by punches, KO by knee)