One major flaw to this article doesn't point out is that you may have a numbers advantage, as the coach and author suggests as the reason to why this works. Or,

One major flaw to this article doesn't point out is that you may have a numbers advantage, as the coach and author suggests as the reason to why this works. Or, you may have a practice advantage against your opponent. Practice advantage means that very rarely do teams practice their onside kick coverage or their 4th down defense on the opponents 12 yard line, because it just never happens. So the week before you play this team, your coaches will over index on the amount you practice onside kicks and 4th down coverage, meaning there will be a lot less time to practice for their actual offense and defense.