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I wouldn't overestimate Jacob's powers. I think they have an overall commune with The Island that allows them to set rules, but I don't think they are all powerful.
Keep in mind that Jacob was mortal, and the only things we ever saw him do was have the ability to not age, and share that ability, and also touch people to bring to the island.
It's not like he was shooting lightning out of his fingertips, so I wouldn't expect Jack to be doing those things either.
Jack seemed like he was slowly coming to understand his abilities. I think that was the point of showing him standing in the water letting it sink in. He even admitted he wasn't exactly sure what's different. Yet he was instantly able to arrive at the light source, and seemed to have stronger instincts. That's probably the deal. You grow into it, I guess. Jacob didn't seem any different once he drank the wine.
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