diff --git a/src/Microsoft.AspNet.Mvc.Abstractions/ModelBinding/ModelBindingResult.cs b/src/Microsoft.AspNet.Mvc.Abstractions/ModelBinding/ModelBindingResult.cs
index cb68815d6b..82fea79acf 100644
--- a/src/Microsoft.AspNet.Mvc.Abstractions/ModelBinding/ModelBindingResult.cs
+++ b/src/Microsoft.AspNet.Mvc.Abstractions/ModelBinding/ModelBindingResult.cs
@@ -76,20 +76,6 @@ namespace Microsoft.AspNet.Mvc.ModelBinding
             return Task.FromResult(Success(key, model, validationNode));
         }
 
-        /// <summary>
-        /// Creates a new <see cref="ModelBindingResult"/> using the provided <paramref name="key"/>.
-        /// </summary>
-        /// <param name="key">The key of the current model binding operation.</param>
-        /// <param name="other">The other <see cref="ModelBindingResult" /> to copy from.</param>
-        public ModelBindingResult([NotNull] string key, ModelBindingResult other)
-        {
-            Key = key;
-
-            Model = other.Model;
-            IsModelSet = other.IsModelSet;
-            ValidationNode = other.ValidationNode;
-        }
-
         private ModelBindingResult(string key, object model, bool isModelSet, ModelValidationNode validationNode)
         {
             Key = key;
@@ -171,7 +157,7 @@ namespace Microsoft.AspNet.Mvc.ModelBinding
             }
             else if (IsModelSet)
             {
-                return $"Success {Key} -> {Model}";
+                return $"Success {Key} -> '{Model}'";
             }
             else
             {
diff --git a/src/Microsoft.AspNet.Mvc.Core/ModelBinding/CompositeModelBinder.cs b/src/Microsoft.AspNet.Mvc.Core/ModelBinding/CompositeModelBinder.cs
index 1156585055..40ed1ee1bd 100644
--- a/src/Microsoft.AspNet.Mvc.Core/ModelBinding/CompositeModelBinder.cs
+++ b/src/Microsoft.AspNet.Mvc.Core/ModelBinding/CompositeModelBinder.cs
@@ -32,51 +32,16 @@ namespace Microsoft.AspNet.Mvc.ModelBinding
         /// <inheritdoc />
         public IReadOnlyList<IModelBinder> ModelBinders { get; }
 
-        public virtual async Task<ModelBindingResult> BindModelAsync([NotNull] ModelBindingContext bindingContext)
+        public virtual Task<ModelBindingResult> BindModelAsync([NotNull] ModelBindingContext bindingContext)
         {
             var newBindingContext = CreateNewBindingContext(bindingContext);
             if (newBindingContext == null)
             {
                 // Unable to find a value provider for this binding source. Binding will fail.
-                return ModelBindingResult.NoResult;
+                return ModelBindingResult.NoResultAsync;
             }
 
-            var modelBindingResult = await RunModelBinders(newBindingContext);
-            if (modelBindingResult == ModelBindingResult.NoResult)
-            {
-                // Unable to bind or something went wrong.
-                return ModelBindingResult.NoResult;
-            }
-
-            var bindingKey = bindingContext.ModelName;
-            if (modelBindingResult.IsModelSet)
-            {
-                // Update the model state key if we are bound using an empty prefix and it is a complex type.
-                // This is needed as validation uses the model state key to log errors. The client validation expects
-                // the errors with property names rather than the full name.
-                if (newBindingContext.ModelMetadata.IsComplexType && string.IsNullOrEmpty(modelBindingResult.Key))
-                {
-                    // For non-complex types, if we fell back to the empty prefix, we should still be using the name
-                    // of the parameter/property. Complex types have their own property names which acts as model
-                    // state keys and do not need special treatment.
-                    // For example :
-                    //
-                    // public class Model
-                    // {
-                    //     public int SimpleType { get; set; }
-                    // }
-                    // public void Action(int id, Model model)
-                    // {
-                    // }
-                    //
-                    // In this case, for the model parameter the key would be SimpleType instead of model.SimpleType.
-                    // (i.e here the prefix for the model key is empty).
-                    // For the id parameter the key would be id.
-                    bindingKey = string.Empty;
-                }
-            }
-
-            return new ModelBindingResult(bindingKey, modelBindingResult);
+            return RunModelBinders(newBindingContext);
         }
 
         private async Task<ModelBindingResult> RunModelBinders(ModelBindingContext bindingContext)