As noted, I think you're confusing Nate Wieting and Nate Wieland. Wieting is a SO tight end who saw action in 10 games (and started three!) per Hawkeye Sports, though he didn't record any stats. Like Pekar he's mainly a blocking tight end. Wieland is a true freshman LB from Iowa City.
I noticed Wisnieski's absence too and it's not a great sign when there are (at least) four TE slots available and he doesn't show up in any of them. I haven't heard anything about additional injuries, but at this point it seems like any minutes we get out of him would be absolute gravy.
The Paulsens are redshirt sophomores, so there's still some time left. Levi Paulsen has a pretty clear path to playing time -- he appears to be the "next man in" OL this year (at G or T anyway) and I'd guess he'll be starting somewhere (most likely RG) in 2018. Landan does appear to have a steeper hill to climb since he continues to not turn up in depth charts. I'm a little dubious of Lucas LeGrand (or Dalton Ferguson) at RT, but I don't know if Paulsen is pushing them or not. Iowa has recruited well at OL in the last few classes and I think guys like Wirfs and Kallenberger will put pressure on some of the upperclassmen (Ferguson, LeGrand) if they don't take a leap forward this year. I'd be pretty intrigued by a 2018 OL of (L to R) Jackson, Reynolds, Daniels, Paulsen, and Wirfs/Kallenberger. (Or possibly sliding Paulsen out to RT and putting Wirfs/Kallenberger at G, since Iowa likes to do the G-->T transition.)