Why does bootstrap.sh copy the installation scripts to the home directory?

if I understood it corretly from README.MD, we can install like this:

$ git clone https://github.com/donnemartin/dev-setup.git && cd dev-setup
$ ./.dots bootstrap osxprep brew osx

and later when we need datastores, we run

$ cd ~/dev-setup
$ ./.dots datastores

I understand that bootstrap copies the dot files to the home directory, such as .bash_profile and .exports. but why do you also copy the installation scripts, such as .dots and datastores to the home directory, if we are always going to execute them from ~/dev-setup/ (as they can be updated from git)?