I never thought the difference points from Barcelona and Real Madrid will be very far just like this because Laliga is still in week 12 but Real Madrid still have 1 postponed match against Valencia so if they can win from this match then Real Madrid only 6 points behind but indeed i think nobody expect Barcelona is really fantastic because with their current financial condition Barcelona surprisingly can performing well and i have to says when Barcelona hire Hansi Flick as new manager seems they had just make good decision because under him it didn't take long for Barcelona to break Real Madrid's dominance
Yeah, unfortunately Valencia was struck with floods, there are plenty of life lost there, definitely a devastating situation going on there and if you watch the videos (search Valencia floods on youtube if you want but be warned) you will see there was absolutely no way that game could have been played. I feel even when Valencia finally gathers back and becomes ready to play, we are going to see them playing somewhere else probably, it won't be too quick before they could make the stadium ready or anything like that.
So maybe this could be played at some natural grounds, like maybe there are places that is not used by any team right now? Or maybe there are some that government owns? I have no clue about how it's working in Spain, but there must be some methods used where the game is not in Madrid, but probably not in Valencia neither. The gap "looks" 9, but Madrid will certainly beat Valencia without much issues, so it won't be a big problem if you ask me.