∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] {D : Type u_2}
  [inst_1 : CategoryTheory.Category.{v_2, u_2} D] (J : CategoryTheory.GrothendieckTopology C)
  (K : CategoryTheory.GrothendieckTopology D) (G : CategoryTheory.Functor C D) (A : Type u_4)
  [inst_2 : CategoryTheory.Category.{v_4, u_4} A] [inst_3 : CategoryTheory.Functor.IsDenseSubsite J K G]
  [(G.sheafPushforwardContinuous A J K).IsEquivalence] [CategoryTheory.HasWeakSheafify J A],
  CategoryTheory.HasWeakSheafify K A