Actually Edo Tensei ninjas are weaken than when they were alive. It`s true that they have an immortal body, well almost immortal, (Minato`s hands didn`t recovered when he got hit by the Truth Seeking Orb) and unlimited chakra but they are still weaker. Tobiramas didnt said he was at full power, he said that he was at nearly full power and we could see that when he created only 2 clones. I know he was holding the barrier but that moment showed us why they are weaker. Even if they have unlimited chakra their chakra tank is limited and they can`t use their jutsus at full power. Madara body was enhanced with Hashirama`s cells so he can awaken the rinnegan but even so he still was weaker. We can see that when Hashirama used Sage Art Gracious Deity Gates to block Madara`s movements, that time Madara was unable to move but when he came back to life he destroyed the jutsu in a second and while reviving he even said `Finally, i`ll be able to fight for real`.

Now Minato. He is fast lol. He doesn`t necessary needs preps to fight and we can clearly see that when he fought Masked Man. Yes, when he was fighting with 4th he used his kunais to combat his speed and he succeded.