What happened: Seattle acquired the eight-time Pro Bowler from the Indianapolis Colts for a 2027 third-round pick and a 2028 fifth-round pick, putting immediate focus on how seamlessly a veteran interior lineman transitions to a new blocking scheme on the fly. Kyle Long, who saluted Nelson's longevity and toughness, evaluated the midseason adjustment on CBS Sports' Set Hut. Drafted sixth overall out of Notre Dame in 2018, Nelson spent his first eight-plus seasons anchoring the Colts' offensive line before the trade.

Why it matters: Offensive line continuity typically develops during training camp, making in-season guard transitions a significant schematic test even for elite talent. Adding Nelson bolsters interior pass protection for Sam Darnold as Seattle pushes for NFC playoff positioning, while Indianapolis pivots into a sell-off after parting ways with general manager Chris Ballard.

What to watch: Nelson is set to make his Seahawks debut in Week 8 as Seattle integrates him into its starting offensive line.