The theory is that Walt picks up habits/aspects of people he's killed.
Cuts crusts off after Crazy-8
Takes whiskey on the rocks after Gus
...there was another one, but I forgot it.
I thought it was:
Cuts crusts off after Crazy-8
Takes Whiskey on the Rock after Mike
Drives a Volvo (same car as Gus) after Gus
And there was some other things too.
But basically, everyone thinks Skyler will be killed too, since he started doing the bacon on his food. And I assume this theory is saying since he's wearing Jesse's jacket, he's dead too.