I still wonder why people think Floyd should be obligated to fight the Middleweight champion.......
Floyd, who started at 130, should have to fight a full fledge MW??? Sergio hasn't been to 154 in 4 years and 8 fights now, if you count the Murray fight in April. Sergio has his own fights that matter in his own weight class, which he seems to not be taking. Golovkin, Geale, Pirog, and even Quillin at some point possibly.
Floyd-Sergio doesn't need to happen, it'd be a bonus if it did, but there's no obligation for it to happen.