Sorry, I Don't think he is.
Everyone saw a giant flame pillar burning Aldoron's giant Body. But this explosion is a maximize size of Natsu's attack at Aldoron real size. It's not Natsu's human size's attack by himself : Natsu didn't create a pillar of the size of a city. Through he pierced Aldoron's human size's brain and burned him, his real body reacted in the same way. When he attacked Natsu with wood pillars, Giant Aldoron did the same. The giant Aldoron's body is connected to human size's Aldoron seed's brain. As Natsu destroyed the final seed, the Giant Aldoron reacted in the same way, like he was attacked by a Giant Natsu. His body is explosing by chain impact due to brain dead. His body reacted to brain's damage.
Natsu is strong. This chapter shows up that he mastered Dragon Force at will. So he mastered his real climax potential.
But in other way, Jellal did the same with a seed, and Gray + Juvia also…. The fact is that Aldoron brain seed was a minimize (human size) of all Aldoron's power and far above other seeds. The fact is, also, that the destruction of others seeds, reduced the power of Aldoron who was too fast and too strong for Natsu. With 3 seeds destroyed on 4, Aldoron was reduced to 25% of his power in his final battle vs Dragon Force Natsu. But Natsu's performance is still crazy.