any other script calls after get_footer?

hi,

i am writing a plugin for a job, i want to dynamically replace any wp posts from the plugin template, i decided to do it like this…

add_action('loop_start','dynamic_insert_test');

function dynamic_insert_test(){

//any content here to replace the  post

echo "</div>"; //for end widecolumn or narrowcolumn

get_sidebar();
get_footer(); 

exit();

}

i should really follow the full wordpress pipeline to see for myself but was wondering if anyone knows if any script processes happen after get_footer();