User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-32252462-20180323194943/@comment-34061653-20180325020809

It's more to it than Vidar being on par with Thor. With the equipement on it was stated Vidar could crush Fenrir (another being in the top 10). The fact Issei beat an amped Vidar is outstanding for Issei. Considering he didn't need True DxD for this.