This might have been discuss before:
Remember the scene when Jack was on the horse, going back to the sheep. He proclaim to Ennis, "No more beans". Ennis was silent. But when Ennis pick up the supplies and gave the little guy his shopping list, he wrote down soup, and told him "I'm sick of beans". I couldn't help to think if Jack hadn't said anything Ennis would have accepted the supplies without a word spoken.
Jack ability to speak on what he felt, was something Ennis couldn't do. You see Ennis silent but taking in whatever Jack was saying, and Jack did have a lot to say.
Jack was able to get into Ennis's head, asking him questions, and finding out more about him than anyone else, was this being curious or was it part of the seduction?