Fenerbahce is in good form than Beşiktaş currently. They have lost their two last matches. The Jose Mourinho side was combining the Europa League and the Süper Lig. Now that they are out of the European competition, I think they will put more effort into the local league and come up with good results. I don't think four points is too big to be lost, don't forget that there are still nine games to play before the end of the season. Just two draws can make the team lose four points. The only way Galastataray can win this Süper Lig is for them to keep winning games. Hopefully none of their players will get suffer injuries in this international break.
Jose Mourinho was signed by Fenerbahce management to come help the club end Galatasaray's dominance with his experience and that mandate I think was achievable before dropping five points in their last two league games. With 9 points behind the league leaders, Fenerbahce I don't think will be able to win the league title again this season but I have strong belief that they'll perform better next season which might possibly see them lift the league title.