Does the Bible say why God wrestled with Jacob and why this appearance did not become a "big deal"?

During a recent small group meeting recently, several questions about the life of Jacob came up: 1. If God had already chosen Jacob to be blessed, why did God still chose to wrestle with Jacob? So that he could repent and be able to be blessed? 2. When Jacob do not want to let go of God until after the "wrestling", asking for a blessing first, did God give in? Did God bless Jacob so that he would let go? 3. If God showed himself to Jacob, how come it didn't become a "big deal" the way later appearances did? Is there a article/commentary the tackles this question?