130: No one comes close. 135: Shakur would give him a good fight, nice boxing match. Tank would remain dangerous but get schooled. Keyshawn is a knock off version, gets boxed up. Andy Cruz would be interesting, need to see more of him. Mason too raw. 140: Teofimo always performs to the level of his opponent so could win some rounds with Floyd but ultimately gets out boxed. 147: Ennis would be a tough puzzle for Floyd, we're starting to get into the size range where Floyd is stretched. Floyd would be favoured but it's tough. Haney gets schooled. 154: Crawford would give him a really good fight, is capable of winning on his day. Ortiz Jr would give Floyd some resistance, but Floyd wins. For me.. I think Crawford, Ennis and Shakur in that order of difficulty.
Honestly? I don't think any of them could. Crawford would do the best out of them, but I would pick Floyd to win 10 times if they fought 10 times, regardless of whether it was at 147 or 154. I think Floyd wins every round against Ennis as well; his defense is nowhere near good enough to give Floyd any trouble over 12 rounds.