He can do that without PEDs. Just take some time in Jamaica and eat plenty of them Jamaican Yams. Bolt knows Jams!
He shuld unify the division first and then move up to fight in Featherweight. It's only a 4lb difference, nothing major.
No he should not take PEDs. They are for disgraces to the Sport like Jones Jr and Toney. I believe Rigondeaux could beat the best Featherweights without them, however Jones and Toney needed them when they was running scared of the likes of Calzaghe, Eubank and Benn.