Might want to check those numbers again, sport.
TOTAL DEFENSE G Rush Pass Plys Yards Avg TD Yds/G
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1. Ohio State.......... 8 644 1579 542 2223 4.1 10 277.9
2. Iowa................ 8 962 1272 543 2234 4.1 13 279.2
3. Penn State.......... 8 929 1553 528 2482 4.7 12 310.2
4. Wisconsin........... 8 576 1934 480 2510 5.2 18 313.8
5. Purdue.............. 8 1371 1462 529 2833 5.4 24 354.1
Northwestern........ 8 994 1839 506 2833 5.6 24 354.1
7. Minnesota........... 8 1200 1884 561 3084 5.5 24 385.5
8. Michigan State...... 8 998 2148 573 3146 5.5 28 393.2
9. Illinois............ 8 1438 1725 541 3163 5.8 23 395.4
10.Indiana............. 8 1450 1889 578 3339 5.8 30 417.4
11.Michigan............ 8 1627 1801 569 3428 6.0 31 428.5
Though in the scheme of things, 73 yards is not that many.
Did it occur to you that Royston may have more tackles because the Badgers had a much better run defense and the safeties did not have to make as many tackles? Probably not.