Too many pages to go through, so forgive me if this idea has been said already.
What if the reason why the Changelings are trying to get Jack is not because he is a Changeling but because one is hiding within him? Remember the dying baby Changeling that merged itself into Odo in "THE BEGOTTEN" and gave him his abilities back?
Perhaps a Changeling or baby one is hiding inside Jack for whatever reason.
What if the reason why the Changelings are trying to get Jack is not because he is a Changeling but because one is hiding within him? Remember the dying baby Changeling that merged itself into Odo in "THE BEGOTTEN" and gave him his abilities back?
Perhaps a Changeling or baby one is hiding inside Jack for whatever reason.