User blog comment:Derax-Pagani/Chapter 509: Kagura vs. Larcade Review/@comment-3285005-20161108025138/@comment-5303512-20161109135628

Well that's the thing, there is a difference between the power scaling in both verses, Magic level in Nanatsu no Taizai is inconsistent via DC, so it is quantity level, while Strength level can be measured.

In the Fairy Tail verse. Magic is equal to quantity and strength, besides, we don't know what each of their power levels are to determine where each member stands.