We are branching out here from the main topic.

SRL's initial retirement apart from the detatched retina, is due to Hagler's seeming invincibility in those days. (What more with the injury)

I believe Sugar Ray conveniently used the injury to avoid an inevitable confrontation with Hagler at that point in time. He only came out of this semi-retirement and resumed his career, when in his mind, had resolved to come up with the winning gameplan to beat Hagler.

Which he did!( I believe he narrowly won that fight with Hagler too)
So to Sugar Ray Leonard's credit, he himself now is a walking, breathing, and living legend to the sport.