User blog comment:IamJakuhoRaikoben/Sorcerer Magazine, Issue 45: September 2015/@comment-25693405-20151017042430/@comment-25693405-20151017191000

I don't recall that, can someone post a reference? But even if true, Sting and Rouge didn't show much of a power boost when using Dragon Force (via their own will) during the GMG arc.