What's wrong with new players and new guilds? Why they can't win? They earn the same ammount of points as everyone else.
This system is to prevent last minute Seal and to encourage the PvP Part of the Siege. Coming to CS just to wait for the last minute and stay afk is not called "Fun".
Each guild can improve and the guild with the most active and dedicated members will win the CS. Every guild has killers, every guild can win CS.
This event is PvP, it's not afk in the corner and do a buff every 5 minutes waiting for it to end and play 5 mins to seal and then GG.
Best guild/alliance works 2 full hours and that's it.