I don't really know the limitations of Macro. In terms of sheer power I expect Jellal to outclass Mirajane by a fair margin. Jellal is likely going to be one of the strongest if not the strongest wizard from Isghal right now.
Sorry
He just came back this chapter so maybe a little excited. 
Which skills put Jellal above Mirajane? They're both fast. Both of them possesses powerful spells. In skills I'd say they're pretty equal. The only spell that is stronger than Mirajane's spells is Sema. But still, I can see Mirajane dodging it since it need some time to hit the ground. Mirajane can fly.
Yeah perhaps skills was the wrong word I just think subjectively to me speed goes to Jellal and so does the most powerful attack in Sema plus I do believe In terms of what has been shown we are supposed to believe that Mirajane and Erza are roughly on par with each other and I think Jellal has always been portrayed to be a little bit stronger than Erza,whether he is now is unknown I suppose I just think until shown otherwise I'm likely to believe it is the same.
At their power levels during GMG they could defeat Oracion single-handedly? Aren't you underestimating Midnight, Cobra and Zero.Each defeated one of Oracion with difficulty,and then they get a second origin and that they are strong enough to defeat the entire guild! How much do you think second origin their power?
Ok but that's like saying Gray could have frozen anyone which has no proof behind it, we have no idea how powerful Gray was during that arc cause all he fought were demon's which was the magic's specialty. Lucy can't summon the CSK at will so that's useless and than you would be saying that Natsu and Erza multiplied there strength by huge amounts to be able to take them all down with nothing other than second origin and maybe a little training. To me i don't get why people believe MIra to be more powerful than Jellal, I feel like when people say that it's almost like saying she is stronger than Erza by a decent amount, i feel like this is a character in Mira who has shown nothing higher than Erza's power level and has defeated far less strong fighters than her and Jellal has always been portrayed as stronger than Erza imo not by a huge amount but i think it's fairly obvious by the fighters Jellal has fought.
Right after GM arc, the only thing they did was go to sun village before fighting Tartarus. When did they power up. About Gray, by your logic, he can freeze them all, Gray becomes invincible. Also, his magic is DS magic, so its has a special particle that works specifically against Demons. About Natsu, there is the normal one with regular fights, and there is another Natsu with the climax fights, where he can defeat anyone and anybody. Normal Natsu could not melt the ice of DS magic. Also, Lucy loses a key to summon CSK. Also, her magic is limited, so CSK only lasts for a very short time. Only thing we know of Mira is she and Erza used to be rivals. U have to give a little more reason, than saying she is a beast.
We don't know that Gray was as proficient with Demon slaying magic as Silver was and even if he was you have to use some common sense when thinking about why for instance Gray did not Insta freeze the people he has fought since receiving it like Mard Geer and Ajeel briefly, I think it's obvious he can't just freeze anything anywhere otherwise he would have done it. Lucy can technically summon him at anytime but she would lose a key and thus would choose not too because it's impractical and i do not believe that should factor into how we see her power wise. As far as Mira vs Erza i don't really get where your coming from, Erza has an insane amount of armors that give her various advantages giving her imo the highest versatility in Fairy tail, Mira on the other hand has less demon forms however she has shown to be a very formidable opponent when she is using them hence why Gray said that Mira had no glaring weaknesses but i don't believe Erza has shown any either. I do believe that Mira is portrayed as being on par with Erza and i will give her some benefit of the doubt due to her not being a main character and as such not having as many opportunities to fight but i don't see what abilities Mira has shown that makes you think that Erza could never beat her. You are right that defeating people does not make you inherently more powerful than others or even the character you defeat for that matter but it has to have some factor when discussing one's feats imo.
Are you serious? Any high tier within FT could solo OC. Whe the fact you think nobody has a spell as destructive as Sema is laughable, Laxus' casual nuke against Ajeel was on Sema's scale in destruction.
I agree that Makarov could solo the Oracion Seis with Fairy Law. I didn't count him in. As for Laxus, there is no proof that he can use Fairy Law.
You make the Oracion Seis look like crap. You shouldn't forget that Crime Sorciere have trained in the past year as well. The Oracion Seis isn't as weak as they were in the OS arc. Sema is one of the strongest spells ever shown in Fairy Tail. Laxus' attack at Ajeel is not even close to Sema.