It is certain that Real Madrid will win Alaves and a sure bet because Alaves is not as strong as Real Madrid and they will give them no difficulties before Real Madrid gets all three points tonight. Real Madrid have being managing to win their matches recently because of some little challenges that Ancelotti is having with his players.
However, if Real Madrid win their tonight's match, the point gap will be closed for the main time because they will have played seven matches why Barcelona only six. So it is until when Barcelona plays their own match and lose it that i will believe that Real Madrid was able to close the point gap to one point difference. But we the current form of Barcelona who are still unbeaten and have won all their Laliga matches, it will be difficult for them not to win their next match.
That is a sure game but we should not over look Deportivo Alaves because they can also perform great in the match. Real Madrid name is also very low in this season and Ancelotti has been in that club for about 4 years and the team is not improving. They have to change Carlo Ancelotti and bring it someone that can change the narrative of the club. When a coach can't performed well then it affects players. And winning tonight match with Deportivo Alaves is just a prediction and not reality. But we are just predicting that Real Madrid because they are skillful comparing them to their opponent. We should wait and see.
I still find it difficult to understand what you are saying because apart from a couple of games that Real Madrid played draw I don't think they have really dropped in form and saying that Ancelotti has been without improvements for about 4 years now sounds very complicated to me because for this 4 seasons you have mentioned, Ancelotti has done exceptionally well for Real Madrid. The only thing I can say about Real Madrid's game against Deportivo Alaves tonight is that Real Madrid at this time may not want to gamble their chances in the league table since they are already 4 points behind Barcelona who are already topping the league table so i expect nothing from them than to win Alaves and claim all 3 points because they have all it takes to win Alaves without struggles even though anything can still happen in the end.