From the pictures above
SAM: The starting Sam linebacker will be, Ahmad Brooks
Responsible for containing the run, or rushing the QB from that left side, or occasionally covering the TE
The backup SAM will probably be Eli Harold
MIKE: The starting Mike linebacker will be, Navorro Bowman
General of the defense, responsible for tackling
Funny thing is, Reuben Foster is also the perfect Mike linebacker
Foster could rotate with Bowman, if either one is not 100% healthy
WILL: The starting Will linebacker will be, ???
I'm not sure if they have Foster starting so early, we'll have to see how his shoulders hold up
So if not Foster, then competition between Ray Ray Armstrong & Malcolm Smith
I actually thought Ray Ray was pretty good last year in the preseason & week 1, before getting injured
LEO: I assume the starter will be Soloman Thomas (on running downs)
LEO needs to be the fastest most athletic D-linemen
On passing plays, we probably will take out the Nose Tackle, slide Thomas inside, then have Elvis Dummervill rush from that LEO position
1-Tech Nose Tackle: The starter should be, Earl Mitchell
Responsible for 2 gaps, and stout against the run
If Mitchell isn't playing well, Quinton Dial might be a consideration to possibly take his job
3-Tech: I think this will be Deforest Buckner's position ???
Responsible for rushing past the guard to sack the QB
Doesn't have to worry much about double teams, or 2 gaps
Not sure who will be the backup
5-Tech: I guess this will be Arik Armstead (on running downs) ???
Responsible for playing the run, has 2 gap responsibilities
Not sure if his height & pad level will hinder him, in having leverage against guards & tackles
On passing downs, I can see them bringing in Tank Carradine (or Aaron Lynch), to get after the QB
** I don't think both Lynch & Carradine make the final roster, it will be one or the other
** I'm not exactly sure what position Ronald Blair would play on the D-line
** I'm curious what you guys (and Lady Tee), think ???

** Edit: Damn I didn't realize Blair had 3 sacks last year, dude played better & had better numbers than Tank & Lynch. Humm interesting