Having Goku's base transformation around his Super Saiyan 3 form in terms of battle power makes the most sense. Because Goku's normal limits have already been reached, he can't do anything more with normal Chi, except learn to control it better. Hence why Akira Toriyama was forced to introduce a new type of Chi, so he can bypass these limitations and continue to make Goku stronger then he already was. Further-more, it is heavily implied that his Base form is essentially as powerful as his previous SSj3 self from the Boo Saga during the event so EOZ -so presumably, he powered up his Base form to a point where he has no stamina loss. This is what is depicted in Dragonball Super, so I see no reason to disregard anything until I see some evidence that makes EOZ completely contradicted, as far as I know, this hasn't happened yet.