[WordPress] YOOtheme Pro & WidgetKit Bundle

I see that Yootheme Pro Nulled have elements similar to some in Widgekit. My question is if it really a good idea to install Widetkit in Yootheme Pro or it’s suposed to not be needed, because or the functions already incorporated into Yootheme Pro. What could be the advantage of using Widgetkit inside Yootheme Pro at this very moment?
What will you get?

YOOtheme Pro WP v4.4.4
yooessentials-1.4.7
widgetkit-demo-package-wordpress-1.2.4
WidgetKit v3.1.27 Wp
WidgetKit v3.1.26 Joomla
FS Teaser Card v1.1.9.5
FS Table Pro v1.4.7
Switcher Pro v1.1.3
Grid Pro v1.4.8
yootheme Joomla v4.4.4