So I think I have the answer (but doesn't everyone).
Take a look at the Quote Box above and pay particular attention to the color coded text.
Notice the only thing in red?
Notice the break in the pattern from all the green and yellow?
---------------------------------------------------------
It seems to me that the very unfortunate failure of the double combine lies in the fact that ESSENCES in tier 1 and tier 2 do not match.
I do not think that the two Tier 3 Essences have to match 1 & 2 but they have to match *each other*
I also think that the Tier 1 and Tier 2 Essences must match to achieve a successful Tier 3 super effect.
ps. forgive me if this has been said already. it was 4 hours between when i started typing this and finished typing this. **** real life office job!!!
EDIT:
oops. corrected my language usage.
gems, essences, aspects. so many words! brain so small.