Theres been interview of him saying this, his words not mine. Are you telling me that his last several fights have not been slow flat footed brawlers? As for timing Khan, well its easier said than done as Paulie said it during the Alexander fight, its because of how good Khan is at controlling range the punches usually always fall short and the angles and speed that they come at you makes it even harder. Now add the fact that Floyd doesn't posses knockout power and he doesn't throw with you, it just makes it so hard to predict where or how Floyd will steal the rounds against somebody who steals rounds better than you.
Thats not the video but I know that one. When they asked him about Mayweather he said he's a whole different horizon from Alexander which is correct I guess, but so is Khan as the fight played out that way.
I tried to find it but no luck, but I am pretty sure he said that Khan has the ability to cause Floyd problems along with all the other guys who have said it.