In-depth article that talks more about what happened behind the scenes for the Han Solo movie. Some
Lord and Miller:
As soon as shooting got underway, insiders say, it started to become clear that Kennedy’s stated intention of hiring directors who would put their own spin on Star Wars movies had led to a mismatch. Some insiders say that while the talent of Lord and Miller is undeniable, nothing in their background prepared them for a movie of this size and scope. These sources say they relied too heavily on the improvisational style that served them so well in live-action comedy and animation but does not work on a set with hundreds of crewmembers waiting for direction.
“You have to make decisions much earlier than what they’re used to,” one of these sources say. “I don’t know if it’s because there were two of them but they were not decisive.” Production department heads began to complain. While the pair appeared to listen when told of festering problems, this person says their approach did not change.
More trouble happened behind the scenes:
Lucasfilm replaced editor Chris Dickens (Macbeth) with Oscar-winner Pietro Scalia, a veteran of Ridley Scott films including Alien: Covenant and The Martian. And, not entirely satisfied with the performance that the directors were eliciting from Rules Don’t Apply star Alden Ehrenreich, Lucasfilm decided to bring in an acting coach. (Hiring a coach is not unusual; hiring one that late in production is.) Lord and Miller suggested writer-director Maggie Kiley, who worked with them on 21 Jump Street.
Cheering for Ron:
But Lord and Miller were not prepared to have Kasdan become a shadow director. With an impasse reached, Kennedy finally pulled the trigger. The next day, when the crew was told that Ron Howard would take over as director, sources say they broke into applause.
Side note: There was a seperate rumor from a Star Wars fansite [(Star Wars News Net)] (https://www.starwarsnewsnet.com/2017/06/what-our-sources-are-saying-about-the-star-wars-han-solo-shakeup.html) that said Alden’s performance was “oddly comparable to Jim Carrey’s performance in Ace Ventura at times.” This likely supports why the acting coach was brought in.