A lot of what you just posted contradicts posts by a well-known KEF dealer who posts here. Unfortunately, the A'gon thought police tend to delete those threads and I am not interested in searching.
The drivers in the pre-Meta LS50, Blade, and REF were posted as not being the same. The differences were also mentioned. SEARCH to find that info or contact KEF who should be willing to give that info.
Again, what dealers say....is not worthy of repeating.
Actually, feel the opposite when I compare most uninformed posts on here and what I pick up from dealers and vendors. I stop and read the posts by the dealers.