These are the positions that will be a problem IMO.
LB (obvious and well documented): still competition but no major replacements as of yet. Would be a surprise to me if there were changes before week 1.
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OG: Still competition and starters unknown. Likely candidates are Colledge and Smith.
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FS: I don't see Delmas as an improvement over Clemons. Does a few big plays outweigh consistency in tackling and coverage?
Coverage: both pretty good in coverage with the edge going to Clemons. Delmas gave up 4 tds, Clemons 2. 3 ints for Delmas, 1 for CC.
Run support: Delmas has the edge
Tackling efficiency: Edge to Clemons. Delmas was known to gamble more but Clemons was steady.
Reliability: Edge to Clemons. Delmas has injury concerns.
Overall: Not much of a drop off but Delmas will give up a few more big plays as well as make a few more big plays.
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SS: There were going to be questions here even with our full time starter. Not huge issues but rather seeing if Jones' one good season was a fluke.
I like Jimmy Wilson but not at SS. Could be a huge drop off here. He could be a liability in run support and be lucky to make it through 4 games at his size IMO. Should offer equal or better coverage ability.
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DT: Big drop off from Soliai to Mitchell in run defense. Mitchell probably offers more in up-field rushing. Odrick should take up slack if needed. Odrick more stout in run support than Mitchell IMO...and playing for a contract.
As an overall assessment of our defense, we could be in trouble up the middle in the run game. Someone is going to need to step up. At the very least, I like the experiment of Wheeler to SLB and Ellerbe to WLB but one (at least) should get replaced.
I think we will be better in coverage but hard to say vs the run. I see potential for issues here.