1st Hokage, controls 7 Bijuu lets say you get the
- 1 tail
- 3 tails
- 4 tails
- 5 tails
- 7 tails
That's just 5 he can control 7 and all of those put together could destroy Nagato. Nagato can't take on 1 Bijuu with 9 tails and I doubt he can take 5 that add up to 20 tails. The chakra within all these Bijuu's has more, probably than the Kyuubi and the Hachibi. So if Nagato can't take one Jinjuuriki who doesn't know how to use the Kyuubi's Powers (AND ONLY AT 8 tails). How do you expect him to take on 5 Bijuu let alone 7 at once. And with all the other ninjitsu (Mokuton), and he himself has chakra, that of a Bijuu, which means 5 bijuu together and including the first, it means 6. So 7 would mean 8 bijuu, including him

Soo let's see the famous Nagato take on that many Bijuu? No thanks I don't to see one of my favorite characters assassinated.