IN one of the latest scans you see TAV in there armor and there keyblades with keychains.
the poster of TAV and the preppy checkered design behind them showed terra's keycharm having a orange gem, Aqua is BLue and ven has a small light green one.
if you notice terra's and Aqua's keyblade vehicle, Aqua has a small blue point and so does Terrra but orange. you cant really see ven's but if you look at the world section in the BBS official website you see a green charm the tip of his rider.
now oyu notice something? BLUE, GREEN, ORGANGE?
know these colors? it's the color of the charms TAV obtained in the latest trailer.
So of course it's plot-wise rather than retcon
Or it could just be a refrence to their elements.