COLUMBUS — Ohio State has officially entered its second idle week. The Buckeyes arrived home early Sunday morning after the flight home from Eugene after a heartbreaking last-second loss to Oregon on Saturday night. Now the Buckeyes must regroup. For the offense, they have to make sure they have a plan along the offensive line now that it appears left tackle Josh Simmons will be sidelined for the rest of the season and Tegra Tshabola was clearly banged up. And late-game clock-management will need to be sured up to make sure another blunder like Saturday night doesn’t happen again. On the defen…