(It's the heyday now for Purdue quarterbacks in the SEC.) Etling seems maybe a little bit secure in the job for now, but Miles' job might be on the line, and it's not hard to see him going back to Harris if things don't work out well in the early going against Auburn.
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Someone's either going to be 1-3 or 2-2, and neither is particularly acceptable at these particular schools.
Harris is a more talented runner, and Miles and offensive coordinator Cam Cameron spoke positively about Harris coming into the season.
To stay on the field, Etling needs to be good, and that might be a tall order against a strong Auburn defense.