Way to ruin everything built on the previous 8 episodes in less than 3 minutes.
Why Simon Barry, why?
You created a very good sci-fi tv series and then you make a mess with Kiera and Kellogg having sex ?
It's a terrible huge mistake. So season finale, Episode10 is going to open with Kiera in Kellogg's bed, seriously?
You placed all hints since the pilot with old Alec in the future (Smoking Man) pointing to him and Alec romance and you kept placing those same hints even same Episode9... and it would have made sense and allowed you to create all kind of paradoxes..
But then Kiera and Kellogg sex affair is just plain wrong both plot and characters wise. It doesn't make any damn sense for Kiera to have sex with Kellogg. If that is what you did you managed to ruin your own series and failed to see the good things you created about the characters and plot.