In his decision to retire during another impressive winning streak, he ultimately put to rest all discussions of a potential who would win vs him or Silva matchup. I think most people would say GSP now.
All those years that he was ranked #2, just under Silva. Now they may have been put to question only it is too late. GSP to me is the all time GOAT. There are others that are close. But GSP is just unmatched.
He has beaten everybody he has faced (as in his two losses he avenged, dominantly) and he had that massive streak of rounds won in a row, I don;t recall the number but it was like 30 rounds in a row or something.
He had continuously made the top ten of his division look like amateurs against him, even going as far to beating them at their own strength. He could during his prime take down pretty much anybody at will. He was not the best at any one aspect of mma, but he was the best all-around well rounded fighter. He was good at everything.
He is the champion of champions. I don't think he will come out of retirement to risk that now.. just as he didn't take any unnecessary risks during his fights. And although he only won via decisions later in his career, those decisions were mostly dominant and to me very entertaining. we got to see 25 minutes of high level mixed martial arts against two top WW in the world - and the champion always made short work of whomever he was facing. Which of course was always the very best.
How anybody could now rank Silva, Fedor, Aldo over him shocks me. The one guy that can match him is of course Jon Jones. Jones still has some juice left in him though, and we will see if he will surpass GSP's legacy or match him.
One thing that stings is all those years he was ranked # 2 P4P while all the while I believe he could have destroyed Silva.