Just judging by the skull No. 6 apears to be Maria, and that's who we suggest this set of remains belongs to. However we cannot rely on the appearance of a skull for a definite answer. Why we think the rest of the evidence supports our hypothesis:

The pelvic rim & sacrum were fully mature, so this girl was at least 18, and Maples recorded no sign of "recent development." For all intents and purposes, Maria was 19 years old, and considered an adult. Dr. Levine noted that the root tips of No. 6's molars were not fully grown which would bring the average low of her age to 19. Maples also mentioned that No. 6 had the broadest bone structure of the girls' remains, which immediately reminds us of Maria. Tatiana's bones were FAR from big.

One thing that doesn't fit perfectly is that No. 6's collarbone was complete. This is the reason Maples labeled her as Tatiana. Generally one's collarbone matures at about 20, and Marie had only just turned 19 the month prior to her death. However, we must take in for account the fact that everyone develops differently. There is a small chance of the collarbone being developed by 19. It would be on the low end of the average but it's still a possibility.

All that considered this is certainly not Anastasia, as No. 6 is buried as in the Fortress of Sts. Peter and Paul in the old Tsarist Capital of Russia.

 

Anastasia could only be no. 5

Maria could be no. 5 or no. 6

Tatiana could only be no. 6

Maria is the keystone to the problem, if we know where Maria is,
everything else falls into place.

Therefore, to prove that Tatiana is missing,
we must prove that Maria is no. 6.
~ Alia ~