Great chart.
Alaric Jackson, despite being 6' 7", is a pretty good LT with smaller arms than Campbell but obviously a massive outlier as an UDFA with short arms.
Campbell I wouldn't hate but depends on what the scouts think of the other options.
I wouldn't COUNT on Campbell being a LT because odds are against it, but I wouldn't say, based on Jackson and Campbell's incredible athleticism, it's out of the question either. I think everyone seems to agree worst case you get a pro bowl guard. If his upside is really all-pro level guard, then based on other options at 4 that might be the best outcome.
Every non-QB prospect after Hunter/Carter has at least 1 major question mark.
Graham, Campbell, Jeanty, Membou, McMillan, Warren, Johnson, Walker, Banks, Stewart.
You could easily come up with a good reason why none of those guys should go #4 overall.
A trade down is going to be difficult. If so, taking a possible starting LT and definitive high-end guard is not the worst outcome.
Of course, I'm hoping beyond hope Hunter makes it to 4 and then we are all set.