Yes, another star or core player that is versatile enough to know which area needed more focus to help the team achieve a victory in almost every game and can match Luka's energy so that he end up carrying the team especially when it comes to intense games. Just like Giannis who have Middleton and Curry who have Thompson. Honestly, that's what they've been lacking and if they can fill up that spot, I bet they can reach farther than what they reached last season.
Luka is still very young and has not yet reached his full potential. There is time for the Mavs to surround him with the supporting cast that he needs to push the team to a championship. Dirk took almost all his career before he became a champion, and it is worth the wait. Luka hopefully will not wait that long before the Mavs figure out the team they need to win. They should have learned now how to support their stars. They at least have 5 years to work it out with Doncic. It is either they develop their young, new recruit or acquire through trades, but they should not waste the opportunity they have with Luka.
What a big loss it could be if the Mavs will end up losing Luka in the future. Although it is hard to imagine knowing Mark Cuban is not just a team owner but a huge NBA fan and it is also early to speculate.
There was a time when Mavs brought in Kristaps Porzingis. It didn't work and the guy is too injury-prone. For now, the Mavs is pretty sure watching for their next potential target. I also believe that the Mavs can do better if Luka has reliable teammates he can lean on if he is having a bad night.