Ok, alternative timeline where the rematch happens shortly after the first one, like one or two years after their beautiful meeting: Tommy acclimatised at that weight while Ray is still fighting wit' no retina problems, ooahs yayo or whatever brought him to retirement. Best version of each other, so Ray looks sharp like in that Kalule bout. Who you with? Always wished things went like that and it happened earlier...
Tommy by decision, especially if it's only 12 rounds. Tommy by the time he was fighting Benitez, already knew how to grab on whenever he got cornered which was one of the things that lost him the first fight. Still Ray Leonard will always be a livedog in any scenario.