I think a lot of that may prove accurate.
1. OL talent is at a premium, and will be in high demand. I personally think 16 will be the floor for both Banks and Simmons, and wouldn't be shocked if either Josh Conerly and/or Grey Zabel (IOL) snuck in as well. Besides NE @ 4 the Jets (7), Saints (9), Bears (10), 49ers (11), Cowboys (12), Dolphins (13), Colts (14) and Cardinals (16) could all go OL. There are another half dozen or so teams in the back half who could use OL help as well.
In my final mock I have Membou (7), Simmons (8, to NE with a trade-down), Campbell (11) and Banks going top 13, with Conerly and Zabel going top-25. But the demand could be greater. Zabel has been linked to both Miami and Dallas, and could easily go 12-18. So 6 OL in the top 18 would not shock me. If a run starts, teams will be desperate not to get left out.
2. All reports - for what they are worth - are that Jax wants a playmaker for Liam Coen, and are a likely landing spot for Ashton Jeanty at #5, so anyone that wants him will probably have to jump the Jags. I had Oakland trading up with NE to #4 in my final mock, with the Jagyars trading back once Jeanty was gone and taking Tetairoa McMillan.
Recent rumors have been conflicting: a) that teams might be interested in trading into the top 3 for Jeanty, and b) that teams would only consider trading up to 4 with NE if one of Hunter/Carter was on the board. Assuming Tennessee takes Cam Ward, both can't be true (and Ward would be available for trade bait in that scenario). So I think NE will have some trade leverage at 4 - not a ton, but some.