None of that matters, it's not a race for first person to level 70. There will always be a player gap no matter what. New players join all the time, lvl 1 when everyone is 70, they have some catching up to do but that doesn't make the game broken.
Having players that are above the average level is going to be useful. Things like UD, RP's and TMQ's are hard to do with a party all at the same level, you will need a higher lvl player's help. Some quests in DBO will be nearly impossible to do without this.
Not race for you.