Its highly unlikely the OL is a better pass blocking unit, even with Cam and Banks playing hurt/banged up for the back-end of the season (which nobody likes to mention. still wondering Cam's injury, since he didnt compete at the combine). That said I do believe Arch will provide some relief. I think he instantly upgrades pocket awareness and that has nothing to do with his athleticism. His mistakes will be more along the lines of doing too much. That may balance out the pass pro. Less self-sacks, but worse pass pro.
I do wish we had a spring game. I am really wondering, if we will see a dramatic change in the offense. The offense has been mostly horizontal the past few years. Run game has been predominantly OZ. Initially it was screen guys and let Bijan find a hole. RB room took a major hit from Bijan, but Texas has played with 2 NFL OTs the last 2 years. It made sense to run outside behind them. I think this year that may change. Interior is projected to be Neto, Hudson, and DJ. That is where all the experience/maturity is on the OL. I think it is highly likely that group is much better moving people. Highly unlikely to be as good as Conner and Jake in pass pro. OT is likely Goosby and Baker. Baker is a freshman, so no idea what he looks like. Goosby looks like a typical dancing bear at LT. He looks great in pass pro but run blocking hasn't been his thing and may never be his call card. I think that may lead to a bigger focus on rushing between the tackles.
Passing game will likely change. Texas was in the 90th percentile in usage rate on screens and swing routes in the country. The deep crosser and post routes are also staples (missing the post route was definitely a staple in 24). Texas had low usage rates of seams, outs, come backs, go, and curl routes. (tip of the hat to Babers on that information). It has been a heavy dose of short perimeter passing. I think that mix will be significantly different with Arch. He loves to throw deep and you know Sark is jonesing to bring back the vertical passing game. Sarks desire was on full display vs ULM, even he admitted in the post-game presser he called too many deep shots. Everyone knows where Quinn's ADOT was, I would bet a lot of money Arch is not going to be in near the bottom of the league in ADOT