User blog comment:Saphir333/Gray immense magic power/@comment-24264679-20170419142520

1. He defeated Invel after Juvia saved him from dying. Not to mention the fact that he had an elemental advantage thanks to Ice make and DeS magic making him resistant to Invel's Ice. All of this was stated in the Manga.

2. Gray posses DeS magic which gives him an advantage towards Demons. E.N.D if a Demon. Wendy was able to damage Zinconis in the GMG yet I wouldn't say she is as strong as a dragon.

3. No. Unless it was stated he had an immense amount of magic you shouldn't add it.