Where's the option saying It's not real? lol. Anyway, I really have no idea. Although I'm betting the person coming back from a layoff will see better increases than a newbie if both at same level. I think of it like this...I'm sure the CNS adaptions that took place in the person coming back from a layoff can rebound very quickly. Since his body once knew how to efficiently recruit motor units, why would it suddenly forget how to...being that it was the most efficient? Kind of like a bicycle. If you haven't rode one in a while, you don't lose the ability to balance yourself on one.
So, I believe the person coming back from a layoff will maintain some strength and see amazing strength increases for a while. Then say he is near where he used to be and starts training for hypertrophy. He'll blow back up.