This is very common, cutting your session short when you are losing is very easy, as you can simply say that it was not your day and do something else during the time you had planned to gamble.
However when you begin your session with big wins you want to keep gambling as it is easy to think this is your lucky day in which you could obtain big profits, but suddenly your luck changes and your profits begin to go down, now even then you are still in a good position as you are still earning money, but in your mind you can only think on the money you have lost already and then you become even more reckless in your attempts to try to recover that money, only to lose your money at an even faster speed.
the thing is many people lack the emotional control to do it
I agree that it's a simple thing and solves the problem, but not so straightforward to do it if the person is adicted
it'll vary a lot from person to person
You are right and that is what makes the third pattern presented by the OP so dangerous, under normal circumstances if the session does not begin with good results for you then you will immediately switch gears and think about stopping your gambling session.
But when you begin your session with several wins and then your luck runs out those thoughts do not cross your mind, and instead you want to keep gambling and recover what you have lost, which can make your losses many times bigger than if you began your session by losing some money.