Moving to another team in a different league at this time is not a bad option for Joselu considering his own age, which is no longer young. And new players like Mbappe who will strengthen Real Madrid next season can still be used as future players for Real Madrid. Apart from that, Real Madrid management always has a unique way of releasing old players and also bringing in new players so that the team's strength will never decline significantly because the players released are always older than the players who are successfully brought in each new season.
Actually, Joselu looking the realistic with his position if keep stay with Real Madrid after signing two top striker Mbappe and Endrick he will loss opportunity get more minutes playing such as this season get appearance several time as substitutes players.
Joselu has great opportunity behind his age over 34 years old and leaving Madrid for accepting other team offer with guarantee more minutes playing and get bigger payment salary.
Seems not significant impact for Madrid after leaving by Joselu, still has two top striker Mbappe and Endrick with some time Carlo Ancelotti moving Rodrygo for false nine position if both central forward make rotation or under perform.