Social Action Question

The perspective that is missing from my book "Roll of Thunder Here My Cry" is Stacey's and he's the brother of the main character Cassie. Stacey is often represented but you never know what his thoughts are it's only Cassie guessing his thought, and your hear him in dialogues and sometimes Cassie explaining his facial expressions. It is represented most of the time but not all the time since it's in Cassie's point of view and at some points they have to leave each other and you miss out on Stacey's part.
The effect it has on the book is suspension because I think if Stacey's perspective was in the book more then, the audience would have probably figured out what would happen next in the future since Stacey is mostly always in the problems/conversations with the adults and his friends. The reason why I think Mildred D. Taylor left out Stacey's point of view was to keep the audiences' mind going on what would happen next and where the plot was going even if it was on one point of view.
I think if Stacey's point of view was in the story more it would over shadow Cassie's because Cassie is just a ten year old girl an in the story she barley knows what segregation is an why the white people are treating her badly, so the audience would probably want a point of view where the character knows what's going on but they just want to see what he/she what do in the situation since they understand the problem. When the voices that are already there are standing out them the other point of views won't always be looked at but, they would be looked at when things get confusing and they want to know what's happening with curtain characters that they don't hear about.