Ahahaha you're points don't make sense.

So is Mary Jane a rip off too? Jean is dead because she became to powerful and they didnt know what to do with her without making her evil and killing everyone.

Rachel is back because CC loves the character. He created her for DOFP and because of popular demand she was brought to the past.

Many children inherit their parent's penchant for music or singing. Rachel inherited her mother's potential to host the Phoenix, but I believe Jean is the only one who can truly bond to it.

Any Omega can house it, any Grey can actually use it, but only Jean can truly merge with it.

I dont understand how you can like Jean, who accepts Rachel, but not accept Rachel yourselves? Its odd.