Why do Mayweather's opponents not use their Cleto Reyes gloves when the face Floyd?

The Reyes gloves, often referred to as the punchers glove. Less padding on the knuckles more around the wrist. This is the glove of choice for many of the big punchers in the sport. So why did the likes of Mosely, Ortiz and Cotto abandon their glove of choice for their bouts with Floyd Mayweather jr? Cotto used Everlast when facing Floyd, Ortiz and Mosley used Grants, but in prior fights all 3 have used the Reyes gloves and Ortiz switch back to Reyes's last weekend. So does Floyd force them to switch from the punchers glove to a more cushioning glove, or is the just a happy coincidence? Seems a very strange thing for a fighter to do when maybe their best chance of winning the bout was to landed the big KO blow.