Let's say the Gate was open to all who were invited; they declined. The Gate remained open for those who were not invited but compelled to enter. Thus the friend was a third party; someone who wasn't compelled by the King. A third category are those who crept in some other way...I'm sorry but the fact remains that as many as could be found were being urged to come to the Wedding. That means that the gate was open to all on the day of the wedding. In light of that, why would anyone want to or even have to do that which you suggested happened when the friend could just as well enter through the gate like everyone else?
And thank you for not belittling my discussion with you...