@dextersinister: The virus actually does naturally reconstruct itself, its just faster if Alex consumes. This battle is dependent on which Dante were using. DMC3 Dante is the least experienced but has the best abilities out of all his incarnations and those abilities should tip the fight more in his favor. DMC4 Dante doesn't have the abilities DMC3 Dante has but has more experience, this fight could go either way with Dante only having access to rebellion and devil trigger. DMC2 Dante has the most experience out of any of his incarnations and has the most destructive devil trigger, Mercers gonna go threw hell against this Dante. DMC1 Dante falls between DMC2's & DMC4's incarnations where he doesn't have a lot of special abilities outside his use of rebellion but has an extremely powerful devil trigger (considering end game devil trigger) that should give him an edge against Mercer. Finally, DMC Reboot Dante doesn't bring many abilities to the table nor a good devil trigger to help counteract his lack of special abilities, this Dante has the least chances of besting Mercer.
DMC1 Dante (Normal DT) Stalemate<=Loses
DMC2 Dante Wins
DMC3 Dante Stalemate<=Wins
DMC4 Dante Stalemate
DMC Reboot Stalemate<=Loses