As much as I hate activity wins (see: week 1), the idea that this could go to a coinflip is absurd.
The activity win has been set as a rule for this exact purpose. While I agree Jabba did not do "enough," he did "more." Jabba was more active. As I have seen no argument for goofball being active at all, he can not be possibly be given an activity win, and by default, it should be Jabba's.
Goofball waited till the last day to set up a time with Jabba, HIS TIME, and he still missed it, while Jabba was present all three hours of that window. That alone should qualify as an activity win. Goofball's post is shown above by Jabba. I, and I am sure a few others, can be a witness to the fact that Jabba was on and goofball was not.
So, coupled with the fact that goofball was not very active, the fact that he missed his own time should seal the deal for an activity win for Jabba.