This fight was supposed to happen after Toney-Jirov and Hopkins-Hakkar, but it got scraped, probably because Hopkins was unhappy with how much $$ Don King was going to take (i.e. steal) from his purse.
Hopkins is obviously extremely smart and would've devised a game plan to nullify Toney's best strength (counterpunching). Surely, Hopkins wouldn't play into Toney's hands, he'd most likely use the ring a lot more. It'd be an awful difficult task to move up from 160 to 190, and against another very skilled and experienced fighter in Toney. Hell, it's hard to move up like that against a merely decent fighter, let alone a future HOFer.