We know we’ve seen various alums throughout the season, but it’s still a little surprising that they didn’t book much beyond Carrie Underwood for this 20th season finale of “American Idol” and then she went ahead and had to cancel due to a Covid exposure within her group. All that hype, and we don’t even get to see the franchise’s biggest music star (sorry, Kelly, it was close!) perform? Even without Carrie, there were plenty of superstar performers, including “Idol” alum Gabby Barret (with Cade Foehner). She was joined on the night by Flo Rida, Earth Wind & Fire, Deana Carter, Ben Platt, Tai Verdes, Sara Bareilles, Thomas Rhett, James Arthur, Michael Bublé, and Melissa Etheridge. To keep things exciting as the night progressed, the Top 3 were set to perform multiple times. And after the first two rounds, a live snapshot of the voting results at that moment will both determine and eliminate the third-place finisher. That’s one way to keep people invested in v