I'd have to think that Saul would absolutely love to see Jesse/Mike take Walt out of the picture.
Would he tell them about Lily of the Valley? I doubt it, but it's not out of the question. He'd implicate himself, but I'm assuming he's more scared of Walt than even an angry Jesse.
More likely, I would think that Saul would find other ways to help Gilliga, err Jesse, start to figure out what everyone else has (well, you know, except the star DEA agent).
Regardless of exactly how, it would make perfect sense that Saul would be a catalyst to help swing Jesse over to Mike's side and start the war.
		
		
	 
Do you think that Saul thinks Jesse is capable of outwitting and killing Walt? If you were him, would you take that chance? If anything, you go to Mike, not Jesse.
		
 
		
	 
I'm not so sure Saul wants Walt dead.
		
 
		
	 
I'm not so sure any of those four want any of the others dead.
		
 
		
	 
Why not?Obviously, I can't be 
sure of anything, but it certainly seems that way.
Mike wanting Walt dead seems to be the most obvious. He wanted to kill him earlier, and I don't see how, in a million years, that he would think he needs Walt alive or that Walt being alive is anything but a liability on a number of levels.
When Mike's methylamine connection runs out, I could see Walt wanting Mike dead. He doesn't want him dead yet, but that moment's fast approaching.
Why would Saul want Walt alive? I just don't see it.
Saul could continue to make a healthy profit with just Mike/Jesse running things. Walt's a time bomb that will get them all killed or arrested. I think Saul sees this.
Saul's generally level-headed about the best way to handle these situations and has no qualms with using murder for the "greater" good ("Why don't you just kill Badger?").