To update and speculate from the original post:
RB Gillislee - hamstring injuries can take a while to heal. No need to rush him back, okay if he misses a few September games. Was present at 8/22 practice.
LT Solder - back at practice on 8/22; presumably will start week 1 vs KC.
OT Garcia - still out; starts season as game day inactive?
OT Waddle - back on field 8/22; probably will not make 53-man roster unless Garcia goes on IR.
TE Lengel - had off season surgery on finger. May have had a setback to that recovery. Will probably be waived/injured; was not going to make 53-man roster at this point as TE3 over both O'Shaugnessy and Hollister.
DE Rivers - will be placed on IR when 53-man roster is announced.
DE Wise - in full pads 8/22, but departed to a different field when drills started. I would expect him to be available for week 1.
LB McClellin - absent from practice 8/22; hopefully ready to go week 1.
LB Hightower - back on field 8/22; should be fine for week 1.
ST Slater - could be a game day inactive and miss first few games if necessary.
ST King - in red non-contact jersey 8/22; should be okay for week 1.
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RB Daniels - missed Houston game with unknown ailment. Was not listed as absent from 8/22 practice. Never destined for anything more than scout team work this season.
DE Davis - with such a late start (signed 8/11), was probably destined to the PS from the start. Seen at practice but in shorts on 8/22.
WR Hollister - maybe he has a future as a ST player, but he had no chance at cracking the 53-man roster in week 1.
S Travis - the only thing I recall about him is when he crashed into Justin Coleman, leaving Bruce Ellington wide open for Houston.
OL Jelks (NFI) - on field but in shorts 8/22.