Well, I think because His Spirit is always God's Spirit He really wasn't emptied of His equality there as they are the same Spirit. I just wrote a piece about Jesus praying to the Father to have the same glory that He had with Him in heaven. He prayed this before His crucifixion. The glory of the Father is His selfless love. Jesus was asking for that because He was going to be facing the trail of His life and as a man He needed more of that love, that glory to get Him through..Obviously emptying included the forfeiting of glory, but emptying included equality with God also, which meant a substantial kenosis, in contradistinction to what the Trinitarians here maintain.