Steve, I share the optimism that the IU defense will be better this year than last. Opponents that burned Indiana on the ground in 2017 did it by running outside. Michigan won the game in OT with a touchdown where the RB broke wide. Maryland ran to the outside all day against Indiana as did Purdue. In the Purdue game, their very average RB repeatedly ran 7+ yards to the outside before being touched. As good as Scales and Cov were, they were 4.7 -4.8 guys. Without Ball in the line up, Indiana did not have the speed to stop teams from running wide. Do you believe opponents will have the same success running out side with Roof, Ball and Fitzgerald on the defense? I sincerely doubt it. I believe the DL is as good as last year and the addition of Samuels makes up for the loss of Hoff. Sykes will bring a pass rush that was lacking in 2017. I think our DBs are faster and there is more depth. Caveat being can the guys stay healthy? Losing Ball, Sykes, Robinson for a portion of the season, as well as Riggins were a significant set back in 2017.
That's 3 posters thinking the D might be better than last year. You're being extremely optimistic.
For one thing, you're assuming no major injuries. Most teams lose a couple of starters on each unit before the end of the year.
To me, the DL looks competent, but very thin. Right now, I 'trust' Robinson, Stallings, Sykes, Johnson, Everett and Barwick there. And possibly Samuels. With regard to Samuels, I sure don't seem him "making up' for the loss of Hoff. Samuel was a part-time starter for a bad Syracuse team. Hoff was pretty darn good, imo. Wilson, Bowan, Ziemba will play. Head, King, and Bryant might. Looking at that unit as a whole, again...competent but thin. Off-hand, nobody looks like a 2nd team ABT or better. At best, this looks like an average BT DL.
At LB, you grossly devalue Scales & Covington....those 2 guys are probably the best LB duo we've had in 20 years. Willis & R. Jones have experience, but have always been reserves. Roof is quick and aggressive, but also small & inexperienced. C.Jones, T. Allen, Burnam, Miller are very inexperienced. McGinnis isn't starter worthy. I don't see anyone here that will likely be 3rd team ABT or above. On the face of it, this looks like a below-average BT LBing corps.
The defensive backfield (including Ball here) looks to be the best unit. Ball's a guy who I could see being 2nd team ABT with a big year. Crawford might be 3rd team ABT with a nice year. However, the other 3 guys will all be new starters. I would consider Riggins, Bryant & Brown to be very average. Again, the reserves are very talented but smallish and inexperienced (except for Fitzgerald & Matthews)---Burgess, Layne, Taylor, Williams, Johnson. Remember how Fant, (talented and smallish) did his first year playing? Not so great.Maybe these guys will be better right off the bat, but I wouldn't count on it. Taylor, for example, never even played CB at the HS level. I think you're expecting these guys to be ball hawks right off the bat, and it probably won't happen. To me, this unit has the potential to be an above-average BT unit, but only if a few of the young guys are really ready to play significant roles fairly early on.
All-in-all, it seems to me that many of our most experienced defensive players are pretty average or below in talent, while many of our talented players are very inexperienced. Ball is the one guy I see as a possible 1st team ABT type at this point, and he'd really have to step up the productivity to get there.
Now......lets say you take a couple of starters away from these units:
Robinson & Willis or
Crawford & Sykes or
Roof & Barwick....
how we lookin'?
So.....I hope you're right, but I think you're wrong. I'm really hoping our O will step up significantly and offset what is likely to be not better than a top 50ish D overall.