Ianto is Mr. Make Everything Run Smoothly. Remember his comment on the drive to the wedding about "the happy couple just want everything to be perfect on their day"? I think he was reminding Jack to keep Torchwood practicality out of it, in a way. So in following, he would have been glad jack danced with her and gave her his blessing to go have a nice normal honeymoon. And then before her big day got too Torchwooded up, Ianto cuts in and let's Gwen go off to be with her family.
Also, the awkward dress buying scene fits with ianto as wedding fairy. In that scene we see he's willing to go through uncomfortable situations to help preserve Gwen's real life, including dancing with Jack in public to send Gwen back to her TW3-free fun.
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Ianto is Mr. Make Everything Run Smoothly. Remember his comment on the drive to the wedding about "the happy couple just want everything to be perfect on their day"? I think he was reminding Jack to keep Torchwood practicality out of it, in a way. So in following, he would have been glad jack danced with her and gave her his blessing to go have a nice normal honeymoon. And then before her big day got too Torchwooded up, Ianto cuts in and let's Gwen go off to be with her family.
Also, the awkward dress buying scene fits with ianto as wedding fairy. In that scene we see he's willing to go through uncomfortable situations to help preserve Gwen's real life, including dancing with Jack in public to send Gwen back to her TW3-free fun.