After nearly losing to ND in 2015 (at home), the ACC seems to be protecting their front runner.
Can't take a chance on a possible 2 loss season.
ND has played 4-5 ACC games each season. There are 14 ACC schools. When ND plays an ACC school, the return trip usually won't take place immediately. It's the same reason why ND hosted Louisville in 2014 yet doesn't make the return trip until 2019.
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Just like FSU came to ND this year.