we don't know how powerful these new young Awakening Twins are, as they are still trainees without even a rank yet.
it could be very well that the "Claymore Project" has been abandoned, and instead, they have 23 Awakening Twin Claymore pairs....
for all we know there's the next Era (or generation) of "Claymores" of Awakening Twins, with Clarice's Era of Claymores as the last of the normal Claymores.
so, in other words, there might be an entire new Era (or generation) of Awakening Twins, and these young trainee Awakening Twins could very well be the weakest of them...
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Raki can't be the "ace or trump card" due to the time-line, as this (the east with Miria attacking the Org HQs) is happening at the same time as the start of the chaos in the west.
also, Rubel says that these young-trainee Awakening Twins are but "children", implying that this "ace or trump card" is mature, aka been around awhile... also making it NOT be Raki as well.
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as to what this (singular or plural) "ace or trump card" is, we've no idea.
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one thing though I'd like to point out:
for the very very very first time, we see "disfigurement" with Rubel. in one of the pics in chapter 106, Rubel's hands show bulging veins....
is Rubel going to Awaken.... revealing himself and tear Miria to shreds... lol...
(remember I have my theory that Rubel is the actual leader of the Organization, and not Rimuto, and I'm still maintaining this !!)
at the very least, Rubel's behavior is very mysterious..... even chuckling about whether Miria is going to try to kill him.... whereas that other Black Coat that Rubel talked to was in a panick...
who is Rubel? what is Rubel? what side is Rubel on? is Rubel friendly to Miria or hostile? is Rubel really a spy for this other side or is this all a lie by him with him actually being the leader of the Organization playing EVERYONE for fools (my theory, hehe)... ?