This is true, there in the recent defeats of Manny, there's no boxer I have seen that completely dominate Manny.
His last 2 losses against Mayweather and Jeff Horn are both controversial, especially the last one where fans feels that Manny got robbed.
So there is no reason why we should bet against him, he is a legend and he still can fight, going against him is not a wise idea as he is still capable of knocking down opponents.