The initial de-load is worth about 10 pounds. That is, anyone can drop 10 pounds in a couple of weeks by cutting back on carbs, exercising a bit, and pooping a few times. I routinely bounce my weight 6 to 8 pounds on a day, given my food intake, water intake, and activity level.
The real test is over time, and the weeks following.
What happens a lot of time is that folks don't diet properly, de-load, then, find after they're deloaded that they can't lose very much. They get frustrated, binge, and start it over. Many folks fail because they dont' eat enough, and invoke the famine syndrome, turning their body into a fat storing machine.
If you can keep a 2 to 3 pound average per week, that's real good. If you happen to gain 10 pounds, even overnight, which is easy, don't sweat it. You get back on the horse and ride it. If you get so you can't lose weight, and are lethargic, you need to EAT MORE.
Last week, at my low point, I was 206.8. At my high point I was 214.5. That's very normal. It's more important to look at trends, and, throw the first weeks of diet out, as the deload is just dumping off the gylcogen load.