How can I compare chapters five and seven in The Catcher in the Rye?

The gist of Chapters 5 and 7 of The Catcher in the Rye are as follows, respectively:  Holden writes the composition about Allie's baseball mitt and then he decides to prematurely leave Pencey Prep for New York City.  In Chapter 5, Holden seems to be in a mental place in which he is still trying to connect with the boys at Pencey.  He takes on Stradlater's composition as a way to connect with him and ends up writing the essay about a pretty personal item:  Allie's baseball mitt.  However, by the time we get to Chapter 7, Holden has decided that he cannot stay until the start of Christmas break, and he disconnects himself from the boys at Pencey.  At the end of Chapter 7, Holden yells, "Sleep tight, ya morons!" before heading out of the dorm.  He has decided that the school is full of "phonies," and he no longer wants anything to do with the boys.  So, the two chapters contrast in the level of attachment that Holden exhibits towards the other boys at Pencey Prep.