I see a lot of posts where it is said that extra easy doesnt work for them and that they gain or stay the same.
Extra Easy works and should work for everyone (unless you have a medical condition etc where the plan is not suited for you).
Slimming World would not push forward the Extra Easy plan if it didnt work and they wouldnt make much money either, as everyone would be quiting and go on to other diets. A lot of research has been done for it, speaking to nutritionists etc.
If it isn't working for a particular member, then your consultant should be looking at your weekly meal planner, to see what the problem might be. It could be a very simple thing that you are doing wrong, which once adjusted should see the weight coming off.
You lost 5lbs which in my eyes is a brilliant weight loss. I would be reluctant to assume this is water rentention.
Keep at it, it does work.