Oliveira was actually landing power on Topuria early and things were hairy, but if Oliveira did not manage to knock him out or sub him quickly, his mediocre chin and hittability would predictably do him in. Topuria KOs Oliveira in the first round, in the pocket.
I think the odds were pretty justified considering the second Chandler fight, where Oliveria at times struggled against a past it Chandler, though Topuria perhaps needs to mind the bigger men in the clinch/grappling as Charles seemed to be muscling him around at times. Could be a problem with someone like Makhachev.