User blog comment:Miskos3/Fairy Tail Episode 246: Tartaros arc: Underworld King, Review/@comment-26451407-20150818225654/@comment-4933386-20150819021132

I think even when he can creates those, their power is dependent on the user... in this case Rustyrose. Kind of like Gemini's Transformation magic. if Lucy is not as strong, gemini can't transform into something as powerful as Erza (as mentioned during the Grand Magic Games against Flare)

Or another case is if he summons an entity... their power will only possess like 5% of the real thing or something.