These are just there to account for forms without shipping. This code:
<?php echo (WA_coalesce(array(WA_getSavedFormValue('CheckoutWizard_NewFromBlank_Default','First_Name_2'),WA_getSavedFormValue('CheckoutWizard_NewFromBlank_Default','First_Name')))); ?>
says use the shipping first name if it exists, otherwise use the billing first name.
If you just want the billing first name all you need is:
<?php echo (WA_getSavedFormValue('CheckoutWizard_NewFromBlank_Default','First_Name')); ?>