Not saying he would but what if he beat Lewis in their encounter? Would he end up to beat Holyfield and if not would he be successful at all afterwards?
If the judges gave him the fight for some unknown reason, he’d likely lose his very next defence, unless it was a tune up fight, but I doubt they’d do that with Mavrovic, they’d feed him to someone who’s marketable or someone who’s already a big name, like Holyfield to give them the titles.
He would have ended his career because he was already sick when he faced Lewis. Mavrović was a good boxer, but he didn't have the potential to be a champion even if he had been healthy. He was worse than Hrgovic, less dangerous than Takam.