It is not easy to develop good co-ordination with fellow players, when you are new to the team. Talisca has been the leading scorer for Al Nassr this season. The problem here is that he has never played with Ronaldo before. So it will take some time to develop the team bonding and get used to the style of play. And if I remember correctly, Ronaldo was parachuted directly to the match against PSG. He didn't got much time to get acclimatized to the conditions in Saudi Arabia. But IMO, there is nothing to worry. Ronaldo is a great player and he will find his rhythm very soon.
True, it looks like this is just a matter of insufficient adaptation time between Al-Nassr's players and Ronaldo. But so far Talisca has been the foundation for scoring goals for Al-Nassr and with the arrival of Ronaldo this task should have been divided properly, so each of these players will continue to help Al-Nassr achieve the best performance this season. But it looks like in Al-Nassr's next match they will not be strengthened by Talisca who was absent due to a red card in the previous match and now Ronaldo has to prove that he is one of the best players of this century and give Al-Nassr fans a win against Al-Nassr Wehda in the game tonight.