Leaderboard script needs editing, can anyone help?

function onPlayerEntered(newPlayer)
  local stats = Instance.new("IntValue")
  stats.Name = "leaderstats"
  local kills = Instance.new("IntValue")
  kills.Name = "KOs"e
  kills.Value = 0
  local deaths = Instance.new("IntValue")
  deaths.Name = "Wipeouts"
  deaths.Value = 0
  kills.Parent = stats
  deaths.Parent = stats
  while true do
    if newPlayer.Character ~= nil then break end
    wait(5)
  end
  local humanoid = newPlayer.Character.Humanoid
  humanoid.Died:connect(function() onHumanoidDied(humanoid, newPlayer) end )
  newPlayer.Changed:connect(function(property) onPlayerRespawn(property, newPlayer) end )
  stats.Parent = newPlayer
end
function Send_DB_Event_Died(victim, killer)
  local killername = "no one"
  if killer ~= nil then killername = killer.Name end
  if shared["deaths"] ~= nil then
    shared["deaths"](victim, killer)
  end
end
function Send_DB_Event_Kill(killer, victim)
  if shared["kills"] ~= nil then
    shared["kills"](killer, victim)
  end
end
function onHumanoidDied(humanoid, player)
  local stats = player:findFirstChild("leaderstats")
  if stats ~= nil then
    local deaths = stats:findFirstChild("Wipeouts")
    deaths.Value = deaths.Value + 1
    local killer = getKillerOfHumanoidIfStillInGame(humanoid)
    Send_DB_Event_Died(player, killer)
    handleKillCount(humanoid, player)
  end
end
function onPlayerRespawn(property, player)
  if property == "Character" and player.Character ~= nil then
    local humanoid = player.Character.Humanoid
    local p = player
    local h = humanoid
    humanoid.Died:connect(function() onHumanoidDied(h, p) end )
  end
end
function getKillerOfHumanoidIfStillInGame(humanoid)
  local tag = humanoid:findFirstChild("creator")
  if tag ~= nil then
    local killer = tag.Value
    if killer.Parent ~= nil then
      return killer
    end
  end
  return nil
end
function handleKillCount(humanoid, player)
  local killer = getKillerOfHumanoidIfStillInGame(humanoid)
  if killer ~= nil then
    local stats = killer:findFirstChild("leaderstats")
    if stats ~= nil then
      local kills = stats:findFirstChild("KOs")
      if killer ~= player then
        kills.Value = kills.Value + 1
      else
        kills.Value = kills.Value - 1
      end
      Send_DB_Event_Kill(killer, player)
    end
  end
end
game.Players.ChildAdded:connect(onPlayerEntered)

That is the part of the script that gets the Ko's and Wo's

game.Players.PlayerAdded:connect(function(P)
repeat wait() until P:findFirstChild("leaderstats")
  local Rank = Instance.new("StringValue", P.leaderstats)
  Rank.Name = "Rank"
  Rank.Value = P:GetRoleInGroup(2728504)
  end)

This part gets the Rank from the group, due to the group system people not inside the group will appear as "Guest", I need to know if it's possible to change this and if so how. On top of that, I'm trying to add a new section to the leaderboard called "Regiment". It would need to display "7th Regiment" if inside a main group but not sub one and if in the sub one also it would display "1st Regiment". If you don't understand what I mean please comment.