Incarnation of Arhat Ji Gong 濟公

Chinese often worship Ji Gong and I personally believe it's a misconception of Buddhism or something need to be revised by Buddhism teaching/new Sutta? Source of Ji Gong >  He was widely recognised by people as the incarnate of the Taming Dragon >Arhat (Chinese: 降龍羅漢; pinyin: Xiánglóng Luóhàn), one of the Eighteen Arhats. > > Xianglong Luohan (Chinese: 降龍羅漢), also known as the Taming Dragon > Arhat, is an arhat and one of the Eighteen Arhats in China.[1] His > Sanskrit name is Nantimitolo and origins are said to derive from a > Buddhist monk Mahakasyapa , the leader of the first Buddhism Council Meeting. 1) As far as I understand, one who enters nibbana would not be incarnated again ?  2) My curiosity is very high regarding the spiritual world. I just want to ask the Ji Gong during possession some questions. i.e. Question 1# above and some 4 Noble Of Truths doubts. True Arhat should be able to answer right? Is this action appropriate? Here is the sample of the possession that visitor can ask Arhat a question or attend Buddhism session.