In addition to @actingpower’s answer, I’d like to add that I believe I’ve heard Jim or Melanie report that the relationship of the Element quads to KTAD may be rotated. That is, that for some Element quads, the upper-left is not necessarily Knowledge, the upper-right not necessarily Ability, etc. So, going with this idea may help down to the Variation/Issue level, but could lead to invalid conclusions below that.