also not sure if this is relevant, but the parallels between this composition of armin/shifters and that of ymir and the nine titans strikes a chord for me. when this illustration is used within the ED, we see ymir's image slashed - could this tell the end of the titans powers?
so the rumbling happened and most of the world is destroyed, how will humanity continue? if my theory about humans rising from the colossals are true, even willy tybur said there were "tens of millions". not the world population but close enough to rebuild...
i don't have much to say in regards to the theories that eren might still be in paradis due to his warhammer titan, but i do believe historia's child is meant to symbolise a new beginning in a world free of the titan powers. thanks for reading!