Weakest in what way? The hokage is supposed to protect the villagers. There are many ways to do that - remember Pein's arc? She sent Katsuyu to heal anyone she could and, even though there were casualties, seeing as how Danzo was content with them it seems there were going to be many who lived. Let's face it, no one Hokage could stop all of Pein's bodies in a few seconds so that nobody is killed. Even the 4th. There are many aspects of strength, after all.
About the chapter - Naruto seemed to be going for the Shadow clone jutsu so he probably wanted to end this quick - keep Raikage occupied with the clone for some time so he could not stop the real Naruto. to all of you dying to prove me wrong let me ask you this - how many jutsus using seals does Naruto know? Well? Yes - Shadow clone jutsu, maybe transformation jutsu (imagine harem no jutsu in rikudo mode... yeah it would be in no way different than the normal one

) and that's it. Now, which jutsu corresponds to the seal he used? If you went for transformation jutsu I suggest you pay more attention to Naruto's hands before performing his harem no jutsu and not his other parts.
Liked the part where Minato was acknowledged to being the fastest ninja who ever fought Raikage but hated Raikage's whole "he failed" speech. Anyway, I am looking forward to next chapter so we can all see how the story continues
P.S. A and Bee were a team, right? Both A and Bee have memories of Minato, too. So I wonder whether they each fought him individually or did they fight him as a tag team

That would just show really how powerful Minato is - fighting two opponents, one being of almost the same speed as him and the other being not so far behind (Bee said A could dodge his attack, just like Sasuke had when they first fought).