To hear Bears GM Ryan Poles explain it, the board didn't fall the way of defense in Rounds 2 and 3 for the Bears, so they went all offense despite a defense that struggled last year when it wasn't taking away the ball.  Maybe they need another board.  "Yeah, the board, the (draft) class," Poles said late Friday night. "A little bit of life at the back of the round. It’s different (there). But it’s really how the board shook out. We made that turn into (Round) 2, we had a good sense through our research that that was going to kind of be a hot spot at the very top of 2. It wasn’t really possible to get up that high (by trading) without giving up a ton.   "And at the end of the day, we just follow the board."  No defense and plenty of offense will have to mean the Bears outscore opponents, apparently.  Iowa center Logan Jones at No. 57, a trade down to Round 3 and Stanford tight end Sam Roush at No.…