Gravity Forms overwrite the input

gf_input.php

<?php 
add_filter( 'gform_field_input', 'gf_field_input', 10, 5 );

function gf_field_input($input, $field, $value, $lead_id, $form_id) {

    // we don't want to change the admin look behavior of the form field
		if ( IS_ADMIN )
			return $input;

		// lets create custom form html in case it had the css class assigned
		if ( $field['cssClass'] === 'gf-date-picker' ) {
		
			// get the global post values for use with the get_field function
			global $post;
			$id = $post->ID;

			// have we set any values for the location and date field
			if ( get_field( 'loc_date', $id ) ) {
			  // lets star the output buffering
				ob_start();
				gf_generate_datepicker( $id, $value );
				// lets get the output 
				$input = ob_get_clean();
			}
		}

		return $input;
	}
	
	
function gf_generate_datepicker($id, $value) {
	?>
	<input type="text" class="datepicker" value="<?php echo $value; ?>" />
	<?php
}