Any team can have lightning in a bottle for a period of time. It's about being able to sustain it.
Some things to note about Indiana...
1) Yes they went 10-2 last year but the only "big time" game they won was a terrible unranked Michigan team. The rest of their schedule was dog shit and they got throttled by OSU and ND as expected. Very similar to Iowa 2015.
2) The Oregon win was huge and I'll concede that. But the rest of this year they've beaten Illinois who have shown they were extremely overrated, and Iowa by a whisker. The rest are Old Dominion, Kennesaw State, and Indiana State which is a non-major right up there with UMass. They have the easiest remaining schedule in the B1G by a country mile...MSU, UCLA, Maryland, floundering Penn State with no QB, Wisconsin, and Purdue. Come on...
Indiana might be the next big thing but I'm holding off for now. They have had the advantage of a VERY soft schedule the past two years, and only have 1 marquee win. Even Iowa beat a leviathan back in 2018.
Let's not go declaring Indiana as the new big boy in the room just yet.