Constant-congestion integrality-gap conjecture for maximum edge-disjoint paths in minor-closed families

Let ${\cal G}$ be any proper minor-closed family of graphs. The constant-congestion integrality-gap conjecture. The integrality gap of the flow LP for maximum edge-disjoint paths is at most a constant $c_{\cal G}$ when congestion $2$ is allowed. This strengthens the question of whether all minor-closed graph families have a constant-factor constant-congestion integrality gap for maximum edge-disjoint paths; its status is not resolved in the supplied text.