But the blades have a kind of '' shadow flare '', is not like the blades have just the UNIQ into the MDF, blades have that huge black thing in their UNIQ
Well, first off the Blade is not and never has been made of MDF (but you probably know that). And while they have that black thingy around the Uni-Q it's simply not a shadow flare.
If I was nitpicking (or very sarcastic) I could say it isn't by very definition because KEF don't call it so but let's rather look at the facts: It's a totally different shape for a different purpose targeting the same goal. Blade baffles don't have any edges, they don't even have baffles in the traditional way. Still the vertical full circle shape.of the Uni-Q driver must be matched carefully to the horizontal half circle of the cabinet. Providing a smooth transition is the task here.
That's very different from Reference and R series (2018) shadow flares. They are really designed to make sound waves disengage from the cabinet und not follow its contour.
Force canceling woofer arrangements are not new (as has been already discussed by
@Axo1989). Blades had that, too. Uni-Core in the first place aims at reducing cabinet width. It may also provide even better structural rigidity than two drivers bolted together, but KEF don't stress that topic, so maybe my speculation is all wrong.
The major difference in concept between Blade and LS60 is simply the bass alignment: Large volume bass reflex layout here, small volume closed box there. You simply cannot do the latter without active EQ and ideally with additional closed-loop control (as they did with LS60). Thus, any passive version of LS60 would have to be a very different speaker, indeed.