Reasons why he shouldn't;
1) He was a grown ass man playing tag w/ child (seriously). Tobi was using chains!!!! Lol weak
2) His wife taught him all her sealing jutsu, secret to her clan.
3) He didn't defeat the kyuubi alone, idk why ppl think he did -_-
4) his encounter with Bee made him look a fool. While he's jumping around all over the place. Bee simple stood in one place and predicted his movements easily #boss.
5) his one offensive jutsu is child's play now, as it's evolved into so many forms now.
I can go on
1. That kid could easily beat anyone ...
2. Taught ... All the **** people learn at the academy is that also wrong now ? It's like saying I took a test got and a but the teachers said I cheated becauses I studied of the Internet( everyone learns thing off other people Naruto had to learn the rasengan .. And shadow clones of a forbidden scroll.)
3.he died while sealing it doesn't matter what Kushina was doing she was dying aswell ... And he doesn't have a sharingan to use it like a pet or mokuton ( who else could do what he did ? Teleport kurama ? Stop a tbb from destroying a village .. Beat tobi and go on to defeat kurama .. All that none stop )
4. His opponent didn't think he would do that and bee knew he put the seal there .. Not sure though
5. Minato cut a tentacle with just a Kunai ... His rasengan may be what you call child's play but let's see anime get tagged and survive a rasengan to the face ... The rasengan evolving doesn't minato wouldn't be able to own people with it .. It's like saying ms is child play because people got ems and rinnegans now ... Look at how op obito is with ms