So In case anyone is interested. The code for the Leads subpanel on Campaigns is really all in place.
This block of code from DetailView.php is what is keeping it from showing up.
PHP Code:
foreach ($alltabs as $name) {
if ($name != 'prospectlists' and $name!='emailmarketing' and $name != 'tracked_urls') {
$subpanel->subpanel_definitions->exclude_tab($name);
}
}
I changed it to and they show up 
PHP Code:
foreach ($alltabs as $name) {
if ($name != 'leads' and $name != 'prospectlists' and $name!='emailmarketing' and $name != 'tracked_urls') {
$subpanel->subpanel_definitions->exclude_tab($name);
}
}
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