I assume Comcast exec's are crunching all the numbers on Disney's bid and what a comparable bid would look like.
Most likely, they're going to consider whether to add stock or not, and that's the main question. If Comcast ups stock to at least 30-40% of their bid, I think they can win this bidding war.
Otherwise, I think Disney wins.
Wait until five more days though, but I really thought the same as you did. I don't think Comcast has enough time to convince Fox shareholders how they're a better offer than Disney since the DOJ is trying to speed up the approval of the Disney/Fox deal in response to the integration of AT&T-Time Warner merger. It seems like Comcast is trying to make a counter-bid as less than five days, as they're running out of time, but I'm not entirely convinced Fox will change their mind about its existing deal with Disney.