I think that linebacker will be our strongest defensive position this year. In addition to Brown and Wood I believe that both Nixon and Richards have another year of eligibility. So, in spite of losing an All-American linebacker in Shark Davis, we're still in pretty good shape.
At least in modern times (post 1958) taking 4-year periods, this past 4 years has been the best winning percentage-wise:
2019-23 = 82-33 (.713)
1975-79 = 76-32 (.703)
2018-22 = 84-40 (.677)
2006-10 = 87-43 (.669)