If you do use the "linked lists" method for memorizing a 4x4 or 5x5 cube just know that it is an excellent beginner method, but nothing more. By beginner method I mean that you will be able to achieve very fast memorization and recall times, comparable even to the more advanced techniques like images or word groupings. However, try to do 2 solves in a row that way... it's fun.... or shall I say the opposite of fun in that you can't forget the imagery from the previous solve and are constantly struggling to remember which story came from which solve for anything more than 2 solves per day.
It's a decent beginner method, but it's not scalable to anything more than a beginner method. I suggest trying something like PAO or a 24 image system with either Roman Rooms or Journeys for a better beginner method that is more easily scalable to something better.
Just my $0.02
Chris