Depends on when they cut bait and change to RR or IA. If it is between steps of coverage then auto accept doesn't matter as it will just go to the most senior pilot with a slip in for whatever the next step is. But if they are in the middle of a coverage step when they IA it the pay will go to whoever had it on their schedule at the time during the 12 minute acknowledgement window. If it wasn't on someone's schedule at that moment then it would go to the next pilot who had raised their hand in the batch.