The reason it is advised to have a 1/3 superfree with every meal, is because it limits your portions of the higher calories FREE foods such as carbs (pasta, potatoes etc) and proteins (meats etc).
If you don't add the 1/3 superfree to your plate and are not good with portion control, then you risk overindulging on the FREE foods as mention. The 1/3 superfree helps to balance out your plate and cleverly stops you from over consuming more calories than your body physically needs without having to weigh food or count calories.
That is the aspect that makes Extra Easy, just that - EASY!!!
So with that in mind, I would try and include a 1/3 superfree to your meals. Having it afterwards kind of defeats the object, as you are eating a full plate of the higher caloried FREE foods and then eating more food on top of that. Where as your plate should be more balanced out.
This will give you an idea of how your plate should be in a visual way:
For things like bolognese and chilli's etc you can add all the superfree into the dish, things like peppers, onion, carrot, courgette etc. The list is endless.
Or salad is great and things like steamed veggies/roasted veggies. If you want something quick as a superfree, the frozen bags of mixed veggies come in really handy.
But remember superfree is fruit or unstarchy veg. Sweetcorn, Peas and Parnsips are free but NOT superfree.
For instance, I personally couldn't eat the amount of pasta in a pasta and sauce all to myself, especially not when you add lots of superfree veg to it. So if was having something like that, I would probably share it between two people. Then you have automatically limited the amount of calories you are consuming, by replacing some of the pasta with superfree.
However everyones appetite is different. But as long as you stick to the 1/3 superfree with each meal and are not eating to the point where you can't move, then you are following the plan as advised.
Good luck