First of all, the opinion of the other two captains was that they both knew that they would be targeted by an unknown enemy, which was most likely the world government, and it was curious to see that Luo's reaction was that things had become troublesome.
The purpose of Luo's alliance with Luffy was initially discussed, when Luo offered to pull down Kaido, and Luo chose to ally with Luffy in order to achieve this purpose, and later learned that in the process, he would also pull down his enemy Mingo to avenge Mr. Classon, and by the way, discuss the will and meaning of "D", in order to know that this meaning seems to be related to historical texts? That matter has now been achieved the purpose of the alliance, but it has also evolved into this situation, Luo now feels that it has become troublesome, pulling down the four emperors will naturally have this kind of result, doesn't Luo know...
Then it is also very curious, what is the ultimate purpose and reason behind the alliance between Luo and Luffy? I think it should not only be as simple as pulling down the four emperors, if you want to understand the will of "D" and the truth of the world through historical texts, then it is right to ally with the Straw Hat Ship, because their crew has historical text interpreters, excellent navigators, people who can hear the voice of all things, and also has several pieces of historical texts, indeed the Straw Hat Regiment is the most promising pirate group that will eventually find the great secret treasure and understand the truth of the world and the will of "D", and it is indeed quite in line with Luo's ultimate purpose and the things he wants to explore.
Therefore, I feel that in order to avoid the trouble of being targeted and for the ultimate purpose, after defeating Kaido, Luo continues to unite with the Straw Hat, which should be the best choice for the future.
What do you think?