Yeah you don't get it, the ultimate plan is to get the stolen DS plans to the Rebels.
Obviously Jyn and crew are pursued, and forced to transmit the stolen plans to Leia who "intercepts" them. while on a "diplomatic mission", we learn it's to bring Obi-Wan to Alderaan.
So now she has two plans, recruit Obi-Wan, and get the stolen plans to the rebels. she can't finish either, so uses the R2, etc... , when Alderaan is blown, it's obviously no longer an option, they need to get the plans directly to the Rebels.
I mean do I really have to narrate ANH to you?
To have the spies who
already had the plans be on Yavin, doesn't negate her plan it belittles the freakin ANH movie! Everything Leia, Luke and Han the trio went through to get the plans to the Rebels.
If Jyn and the spies could have just taken the plans there there themselves.
These movies are supposed to serve the original material, not fly in the face of it.
Anyway I really don't care about Rey being Luke and Jyn's baby, or imagining how they meet, it's pure fan service.
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Something much more interesting:
Felicity Jones (Jyn's) weapons?
Notice the two escrima-like-sticks on her back.
Then when she's running with Diego Luna(Cacien) towards the At-At's she's carrying what could be the same?
She also maybe cracks a few stormtrooper heads with one.
Is that the same weapon?