Where are you getting that information?
Okay, let's clear up a few things.
The lightsaber is in one piece. Rey simply knocks it out of his hand at the end of the fight. Whether it was taken off Starkiller before it imploded is unknown, but it wasn't cut in half.
Anovos corrected the statement about being larger for larger heads. It was a mistake by their social media person. the helmet is 1:1.
Again, the helmet is 1:1.
http://i.imgur.com/mpz1bNr.jpg
Still looks too big.
[insert generic complaint about the Anovos Replica Helmet]
I think my cardboard and black construction paper helmet is better, etc.
You can knock Anovos on their abysmal shipping speed, but you absolutely can not knock them on their accuracy.