You don't need 230 pound LBs at this level to have a good defense. There are the measurables for the starting OLBs in 2012 and in (spring) 2021:
6'0" 211 and 6'0" 207
6'1" 216 and 6'0" 207
Can you well which is which? That 2012 defense was amongst the best ever for the Bison.