Royal Mystery Solved?

Bone shards identified as that of Crown Prince Alexei and Grand Duchess Maria ending century-long mystery of the whereabouts of the heirs to the Russian czar.

"It was 99.9 percent clear they had all been killed; now with these shards, it's 100 percent," said Nadia Kizenko, a Russian scholar at the University at Albany, State University of New York. "Those who regret this news will be those who liked the royal pretender myth."

Questions

1) Shards? How many shards? Too many to survive without? If a leg is injured, you can amputate the leg, but go on living.

2) At best, we really only know that the two heirs died and their remains ended up in the same forest where their parents died. Right? How does this end the mystery? Or at least, how does this end the myth?