I don't know how you think you know what Pettine prefers. He had the 1ILB+hybrid in Raven Greene making that D look very good in WK01. Was that because it was vs the Bears and with unscouted looks? Possibly. But none of us knows if Pettine prefers 1dynamic ILB+hybrid/variety or 1chase ILB + 1thumper ILB. In his past he used 2 ILB but that was a while ago and he reportedly has done some studying and evolving as has the league. SF has 2 good ILB but they also probably play behind the best DL in football that can keep both of them clean more often than not.