That’s the problem with Grogu. Grogu not only isn’t putting his all into his training because he misses Din Djarin, but he would absolutely choose saving Din over saving 100 people in a burning building. That doesn’t make him a bad person, but it does make him a bad Jedi. So Luke makes him choose, Din or being a Jedi. Grogu chooses Din, and he respects his choice.
Grogu’s a baby, though. He’s not able yet to understand complex moral questions or to make life-changing decisions. When Luke puts that choice in front of Grogu, there’s no way Grogu at this point can fully comprehend what that choice means. Naturally, a baby is going to feel a strong bond to their parent, and lack the high ideals necessary to commit to being a Jedi. But that doesn’t mean Grogu wouldn’t have grown into a good Jedi.
Every quote I’ve read says Lucas didn’t pay any attention at all to the EU. He always viewed it as a separate universe from his. Which is why he ignored it in everything he made. The Prequels contradict the EU as does The Clone Wars. You’d have fans yelling at him because he changed Koriban to Moraband and it’s just like, well yeah, he didn’t give a shit. When did he “veto” anything?
Read this. There are some more examples that come to mind. George rejected the idea of bringing Vader back in Dark Empire, for example.
See, the way I look at it is that Luke at that point is still stuck in the groove of reviving the PT Jedi. I feel him forcing Grogu to make that choice was premature. He should have just given the mail shirt to Grogu and continued his training. This is perhaps one area where I have really appreciated the ST films. I feel they set the Jedi to reset. Rey has the oldest Jedi texts and is rebuilding the Jedi the way they were originally. The PT Jedi sit in opposition to the Sith and the Sith are now gone so some of their ways are no longer needed. Not to say that they were flawed, but colored by their opposition to the Sith. I feel Luke would have been more successful if he had been able to make such a complete reset and he wouldn’t have made what I consider a mistake with Grogu and then misjudged both Ben Solo and Rey. I feel Rey is the first truly balanced Jedi we have seen since the old Dark Horse comics told tales of the ancient Jedi.
I also feel that what we are seeing in the new High Republic era stuff are the Jedi Lucas kept talking about while what he gave us in the PT is at the point where the cracks are showing and the flaws are coming to the surface.