In this situation, the only way to maximize benefits was for each village to take responsibility for a specific task, or for the offense and defense of a particular area, with their own people doing the commanding. Merge them all together, and they would just end up bickering.
To be honest, Ronglin had no desire to hand Konoha's people over for others to command either. The subordinates would be dissatisfied, for one thing, and he himself did not want it, for another.
It would make him seem weak, as if he had completely handed over even his command authority.
"It'll have to be this way."
Ōnoki, Rasa, and Ay could not think of a better solution either. They could only agree with Ronglin's proposal. Each village would take charge of one area; whatever results they achieved would be their own village's business. If their losses were too severe, they could not blame anyone else—their village simply was not strong enough.
The previously high spirits sank into silence after just a few words from Ronglin. All he could say was that it was more reassuring to handle things yourself.
Fortunately, the enemy they faced was not particularly strong. Otherwise, looking at how Rasa, Ay, and Ōnoki were acting would have been enough to make anyone worry.
Just look at the Fourth Great Ninja War in the original story—an impulsive hothead like Ay had actually become the Allied Forces' commander. What a joke.
In Ronglin's eyes, among the Five Kage at the time, the least suitable person to become commander of the Allied Forces had been Ay!
With that personality of his, he was enough to make people worry. Ōnoki would have been fine, Tsunade would have been fine, even Gaara would have worked. Gaara might have been the youngest, but he