Longtime UFC fan favorite Edson Barboza explained why he decided to retire from MMA following a TKO loss to Esteban Ribovics at UFC 330.Barboza, who has been in the UFC since 2010, is 40 years old and has lost four straight fights. Against Ribovics, he looked extremely slow and was unable to mount much offense as his opponent threw heavy strikes at his face and body until referee Herb Dean mercifully stopped the bout in the second round due to T…