I don't think Darius fought at MW. I think Toney beats Darius at LHW if he gets in semi-decent shape for it, it's a made to measure style for him
Nobody would win cause the fight wouldnt happen at least not at MW cause DM never fought bellow light heavy and theres no way he could come down to middleweight.
In terms of their careers I imagine dm outpoints toney because the two were leagues apart as lightheavyweights. Toney has the tools to beat DM prime for prime and I think we can fairly join the dots to see how could Toney could have been at lhw so fantasy wise i'd pick Toney but realistically he'd never have beaten DM.