Alright, this is the first time I'm ever commenting in a forum in this website and i will try to end all controversies up till this arc...since only few of us are using our logic
1. Grays OPedness- I don't really consider gray OP at all. From what I've understood, silver ate a lot of demons before his encounter with gray which clearly shows how powerful and hyped up he was when he first showed up. He had ice devil slaying ability and most probably got more out of the demons he ate which shows gray had received more abilities other than ice demon slaying.(vs tempesta) He is already experienced with ice, so he uses that creativity with demon slaying moves too, most probably.And silver deliberately wanted to be defeated from the looks of it...if not, even natsu could have kicked his ass. From what he has supposedly inherited, gray now bears a grudge against demons after defeating his strong but emotionally defenseless father in that battle. And there is just a bit of this art that he's gotta master remembering he has ice creativity and has seen silver use a bit from his arsenal.
Natsu's issue- You can't hate natsu, simply never. He is one of those shounen characters with amazing physical and VERBAL capacity. If you are logical enough, you might expect igneel to tweak natsu's dragon slaying power while he was still inlside him. He might have controlled how much magical power he releases during a fight. Considering those moments when natsu OHKOs opponents it might be igneel releasing more power for natsu feeling sympathized for his anger. Now, for a moment let us assume END is somebody else(I already anticipate natsu is end). Igneel said that natsu is capable of defeating end (Now you know how strong he really is but here I might not be accurate enough). Look at the latest fight with Mard, natsu had lost so much temper he went DF now that igneel is no longer inside him. Being a dragon slayer defeating tough opponents seems easy excluding the 2Gs(same thing might have happened with sting and rogue...I don't think their dragons are dead). So him OHKOing opponents in the past is justified and that ain't any nakama power up.( Everyone knows just his strong dragons are, don't they?)
Erza- A badass. Apparently the only one using nakama power up in an excessive way that you want to call it BS. Also, she is the only one to have asspulls. PS can anyone remind me of lector and Lily's logic (vs kyouka).
Natsu and Gray vs Mard Geer- First of all this was one the most amazing fights in FT. It went on well till the very end. When memento mori was used, gray managed to absorb it due to his DmS power (If natsu can absorb lightning, why can't gray absorb this?) Although its early for gray to walk along this lane, I must say memento mori enhanced his powers to deliver that finishing blow.(Also seeing he was demonified). Natsu's rage had also increased due to which he managed to go dragon force and use that CLPS move that we HAVE SEEN before although he ran out of magic right at a moment..., thereby becoming a decoy for gray. A perfect battle full of teamwork and belief upon their partners. NO NAKAMA power ups.
Lastly, there hasn't been any nakama power up in this arc (not even in saber's fight) except in Ezra's parts. Every thing up till now is logical. I know hiro's storytelling skills ad they are amazing and unpredictable.
So, for some fans and all the haters, YOU WON'T UNDERSTAND ANYTHING IN FAIRY TAIL CAUSE YOU GUYS DON'T USE YOUR BRAINS TO DEVELOP LOGIC AND YOU WILL KEEP CALLING EVERYTHING IN THE SERIES BS IF YOU SEE IT FROM A PESSIMISTIC POINT OF VIEW AND AGREE WITH EVERYTHING BAD THAT FORNEVERWORLD SAYS(i know he is not a perfect reviewer)SO IF YOU REALLY WANT TO GO AHEAD WITH FT YOU MUST NOT ASK FOR LOGIC BUT DRAIN IT OUT BY YOURSELF IN THE HOPE THAT IT WILL BE EXPLAINED and for me FT doesn't really have over sized nakama power ups or asspulls Sorry I made this too long, but I have been forced to do it....