Arsenal's elite defensive structure and David Raya's established record of leading the league in clean sheets anchor his 57.5% implied probability, reflecting traders' consensus on the Gunners' backline depth and recent title-winning form. Multiple Premier League sides enter 2026-27 with comparable organizational strength and goalkeeper stability, keeping options such as Robert Sánchez, Nick Pope, and Jordan Pickford clustered near 50% or lower as the field remains open. Factors including fixture congestion, potential rotation, and mid-season roster adjustments sustain the tight distribution across the market, with no single keeper viewed as dominant enough to pull away decisively before the campaign unfolds.