So let me get this straight. Sting is going to unlock the "power of feelings" so he can surpass Natsu.
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Are you f**king kidding me?
If Gajeel doesn't DESTROY BOTH dragon slayers, I honestly don't know what I will do, but I'd be extremely disappointed. This is bullshit if you ask me. Give Gajeel the "power of feelings" if anything, damn. I hope Minerva is just using the hell out of him, and she's the only one with any real power in ST. I don't even think Orga should produce any challenge at all judging by how it's went so far.
I mean, I know this is how FT has always been, and I love it, but let me calculate this. Against Natsu both DS went all out, into dragon force. I honestly don't believe Natsu went above 50% of his full power in that fight, but he still beat both of them. So each of them were less than 25% of HALF of natsu's power. So each DS was less than 1/8 of Natsu's full power in that fight. So for Sting to even match Natsu, he would have to get at least 8x stronger. Just from feelings.
This could all be unnecessary, because I don't actually expect him to even beat Gajeel, but if he does, I've gave plenty of explanation as to why I would be extremely upset.