Justin Fields arrived in Kansas City with the intention of reigniting his career under the tutelage of Andy Reid after a rough 2025 season with the Jets that was marred by poor play and injury. But recent reports from mincamp paint a concerning picture for the former first-rounder, especially with the improved play of rookie QB Garrett Nussmeier. The Athletic’s Jeese Newell shared his mini-camp observations in a recently published mailbag. “Fiel…