This isn't enough. Every forme had something to differentiate it from the newer (and better...) one. They all ended up a tier below the newer forme, except for Giratina-A, but still had something unique to them. The safest (almost SURE) bet is that Weak Kyurem will keep its base 95 Speed and the newer ones will have 90 but eh seriously, just that? Nah.
Well the normal Kyurem is just the incomplete one. The two new ones are more complete. So why would the incomplete one have a trait that really differentiates it from its more complete forme? I just don't see it really getting anything.
 
 
		 
 
		

 
 
		 
 
		 
 
		 
 
		 
 
		 
	 
 
		 
	 
 
		 
 
		 
 
		


 
 
		 
	 
 
		 
 
		 
 
		