Perhaps i'm wrong but while I do agree Jesus will be at the top, I don't think its Jesus then the rest of us. If this were the case why were jesus 12 disciples worried about who got to sit next to jesus on the throne? Lets assume they were talking about an earthly kingdom well we still know that its said over and over in the bible Jesus sits at the right hand of God. So at least there is a throne in God's kingdom. And if so that to me suggests a hierarchy.
I think there will be, but not for all eternity though, but only during the thousand years when one is reigning with Christ over the surviving nations at the time.
1 Corinthians 15:28 And when all things shall be subdued unto him, then shall the Son also himself be subject unto him that put all things under him, that God may be all in all.
Eventually this has to be fulfilled. But in the meantime before this is fulfilled, there are things such as the following to consider.
Luke 19:11 And as they heard these things, he added and spake a parable, because he was nigh to Jerusalem, and because they thought that the kingdom of God should immediately appear.
12 He said therefore, A certain nobleman went into a far country to receive for himself a kingdom, and to return.
13 And he called his ten servants, and delivered them ten pounds, and said unto them, Occupy till I come.
Luke 19:15 And it came to pass, that when he was returned, having received the kingdom, then he commanded these servants to be called unto him, to whom he had given the money, that he might know how much every man had gained by trading.
16 Then came the first, saying, Lord, thy pound hath gained ten pounds.
17 And he said unto him, Well, thou good servant: because thou hast been faithful in a very little, have thou authority over ten cities.
18 And the second came, saying, Lord, thy pound hath gained five pounds.
19 And he said likewise to him, Be thou also over five cities.
This seems to depict a hierarchy of some kind. One servant is rewarded with being over 10 cities, while another one is rewarded with being over 5 cities. Why not the same amount of cities for each? And what is the significance of being over cities after the 2nd coming? Maybe literal cities are not even meant, that I'm not sure about, but that's beside the point even if literal cities are not meant. Something is meant here though, and it's meaning after the 2nd coming but likely prior to the fulfillment of 1 Corinthians 15:28.