OSU's O-line was really poor in run blocking. They had 4 OTs starting on the line to get their most talented guys out there. They pass protected very well, but terrible in run blocking. I seem to recall their line was a mess a few years ago, too, but otherwise that unit has been really solid.
Day isn't messing around. Demoted the DC after 2 games, fired the OL coach, and apparently other firings are expected. Spent $2 mil a year to get Knowles as DC, and they're apparently paying big bucks to get UCLA's OC to become their new OL coach.
Say what you want, but it's clear they're willing to make moves to win. Saban demonstrated the value of ruthlessness in this department.