Dear Jacob,
The reasoning why ADAMS was used in place of BModes at the time is explained in the forum topics linked in my Apr 17, 2015 post above. Basically, (1) the 6 DOFs of the platform were not available in BModes at the time and (2) the flexibility of the rotor has some influence on the tower mode shapes, and this flexibility can be included in ADAMS, but not BModes.
Best regards,