When my Gravity Form has the Rich Text Editor enabled, on the wpDataTables side, when adding or editing a record I cannot switch back and forth between 'Visual' and 'Text' on that column/field.  Can you please help?

Actually, if the text editor was the same as it is when selecting 'HTML editor' as the Editor input type (which I'm not able to do with Gravity Forms wpDataTable), that would be sufficient. 

You can see in the attached screenshots, that the Gravity Forms datatable text editor has only a few of the buttons/options... whereas the HTML editor has everything we are looking for.  How can we made the Gravity Forms editor match the HTML editor?

Gravity Forms certainly does have a more robust editor but what I am referring to is not using gravity forms 'own forms' - I was able to get the HTML Editor input type desired by making the following change to your code: 

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at line 103 of file /wp-content/plugins/wdt-gravity-integration/assets/js/gf_editing.js

change this:
           if (modalBody.find('.wp-editor-area')) {
                modalBody.find('.wp-editor-area').each(function() {
                    tinymce.execCommand('mceRemoveEditor', true, $(this).attr('id'));
                    tinymce.init({
                        selector: '#' + $(this).attr('id'),
                        menubar: false
                    });
                });
            }

to this:
           if (modalBody.find('.wp-editor-area')) {
                modalBody.find('.wp-editor-area').each(function() {
                    tinymce.execCommand('mceRemoveEditor', true, $(this).attr('id'));
                    tinymce.init({
                        selector: '#' + $(this).attr('id'),
                        menubar: false,
                                        plugins: 'link image media lists hr colorpicker fullscreen textcolor code',
                                        toolbar: 'undo redo formatselect bold italic underline strikethrough subscript superscript | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent blockquote | hr fullscreen | link unlink image | forecolor backcolor removeformat | code'
                    });
                });
            }

**********************************************************

So seems to me this could easily be made standard in the plugin (as this would get overwritten when the plugin is updated).