∀ {S : AlgebraicGeometry.Scheme} {𝒰 : S.OpenCover} [inst : CategoryTheory.Category.{u_2, u_1} 𝒰.I₀]
  [inst_1 : AlgebraicGeometry.Scheme.Cover.LocallyDirected 𝒰] (d : AlgebraicGeometry.Scheme.Cover.RelativeGluingData 𝒰)
  [Quiver.IsThin 𝒰.I₀], (d.functor.comp AlgebraicGeometry.Scheme.forget).IsLocallyDirected