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human
[Dragonball Z] Question or two about Freeza in RoF.

So Freeza trains for a few months and goes from just under a Super Saiyan to being able to fight on par with SSGSS Goku. How was he able to attain such power without even unlocking God Ki? 

This is huge. Freeza, the egomaniacal mutant of his race had attained a power unfathomable to anyone besides Beerus And Whis and has risen to the power of gods. Had he bided his time and kept training instead of rushing off to face the Saiyans as soon as he unlocked his golden form, would he even have an equal in this universe? His hubris was his downfall for sure but I firmly believe he could have risen to beyond Beerus and Whis, perhaps even Goku and Vegeta.
gpt
I didn't watch the Movie yet, but according to the preview Manga, Frieza states; that he never had to train to attain his power, because he is a natural Prodigy, even among his own Race. So he continues to state that, with a bit Training, he would easily surpass ~~thoose filthy Monkeys~~ the super saiyans. 

What really bothers me and correct me if i'm wrong but, aren't the Dragonballs only able to ressurect someone who has been dead for less then an earth year? so how do they ressurect Frieza?