isen burger ▁was ▁the ▁" sp in ning ▁full back " ▁and ▁the ▁ 1 9 4 7 ▁Big ▁Ten ▁r ushing ▁leader . ▁ ▁The ▁ 1 9 4 7 ▁Wol ver ines ▁were ▁the ▁first ▁team ▁fully ▁to ▁em brace ▁the ▁concept ▁of ▁def ensive ▁and ▁off ensive ▁special ization . ▁Pre viously , ▁most ▁players ▁had ▁played ▁their ▁positions ▁on ▁both ▁off ense ▁and ▁defense . ▁In ▁ 1 9 4 7 , ▁Fritz ▁Cris ler ▁established ▁separate ▁off ensive ▁and ▁def ensive ▁squad s . ▁Only ▁B ump ▁Elli ott ▁and ▁Jack ▁We isen berger ▁played ▁on ▁both ▁squad s . ▁In ▁November ▁ 1 9 4 7 , ▁Time ▁magazine ▁ran ▁a ▁feature ▁article ▁about ▁the ▁ 1 9 4 7 ▁Wol ver ines ▁foc using ▁on ▁the ▁new ▁era ▁of ▁special ization ▁marked ▁by ▁Cris ler ' s ▁decision ▁to ▁field ▁separate ▁off ensive ▁and ▁def ensive ▁units . ▁The ▁Time ▁article ▁noted : ▁" Mich igan ' s ▁sle ight - of - hand ▁re pert ory ▁is ▁a ▁b aff ling ▁ass ort ment ▁of ▁double ▁revers es , ▁bu ck - reverse ▁later als , ▁cr iss cross es , ▁quick - h its ▁and ▁sp ins ▁from ▁seven ▁different ▁form ations . ▁Sometimes , ▁watching ▁from ▁the ▁side ▁lines , ▁even ▁Co ach ▁Cris ler ▁isn ' t ▁sure ▁which ▁Michigan ▁man ▁has ▁the ▁ball . ▁Michigan ▁plays ▁one ▁team ▁on ▁off ense , ▁one ▁on ▁defense ... When ever ▁Michigan ' s