Of course this is possible. Girona is playing really good matches in the league this year. Artem Dovbyk is a true striker. If Real Madrid had him, I'm sure he would contribute more than Joselu. Joselu was a player who I expected to be better in his Real Madrid career, but he performed very poorly this year. I think Girona can easily take the lead with a little luck.
Why expect a situation that won't happen for the rest of the season.
This is not to single Dovbyk out because he is one of the few strikers in La Liga who has surprised us so far and even now he is competing for the top scorer's prize but when expecting him in Madrid and comparing his contribution with Joselu's he could be worse off in Madrid because in the end Dovbyk's performance could be outstanding due to the club's factors now.
The hype around Dovbyk is still very much there but it's possible that it's seasonal just like it is for Osimhen at the moment.
On the other hand, we also know that Joselu was one of the top scorers in La Liga last season when he was at Espanyol so the performance of some seasonal players like this is unexpected and it could be that now they are very good and next season their performance returns to normal.