we know that full power super saiyan god goku is equalent to 60 percent of beerus power and beerus is equalent to 50 percent of whis power.
In the battle of gods it was stated multiple times that you cant beat a god just by powering up or training and you need godly ki, which makes every other character including super saiyan 4 gogeta a fodder to beerus and whis. even base form god goku is now stronger than ssj4 gogeta.
Just imagine how strong then whis is? he was casually blocking every single hit from god goku and vegeta without even looking! that pretty much makes him virgo shaka of dragon ball z universe.
And we know that Whis is a teacher of Beerus who is the god of destruction so then do you do you think full power whis is strong enought to destroy entire universe or compete against DC characters?