If you have meter, you'll be doing 6C anyways, which still leads to damaging routes with FC, especially with OD.
If you have meter and use 6D for whatever reason, you get 4.7k
If you don't have meter, and you end up getting 6D after FC, you get ~4k in damage using a Messenga route.
If necessary, you can always pop OD after the last hit of 6D and go from there.