Don't think Starling has a good style to beat Floyd at all, he isn't especially fast and had a fairly ponderous, methodical offence and usually took a moment to set before throwing. Pot shot roast, Floyd would catch him setting and move all night. 9-2-1.
Depends on which Starling we see. If it's the Starling who is spending more time clowing around than punching, then Floyd could maybe steal a decision. If not, Starling wins by decision.
Honestly don't think it matters. Starling is Floyd's stylistic wet dream. Floyd would pop him setting his feet to punch and slide off all day and night. Curry and McCrory, even Breland are interesting fights but not this, IMO.