The banshou tenin on KCM Naruto Rock could have well been just one usage. During the one attraction usage, he pulls 2things from different sides, so it doesn't exactly prove the 5seconds limit disappeared and i really doubt that if he could, Kishimoto wouldn't have left a hint for us to understand.
All what Naruto said is that he is stronger because he can use all the powers at the same time, he never said the restrictions of powers disappeared
Banshou tenin doesn't exactly work like Shinra tensei. But nice point nonetheless.
Besides, it still requires enough reaction and chakra build up to be used. Kakashi was close to hit Deva Path for this reason [
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], Nagato couldn't react to Itachi's Susanoo sneak attack for this reason [
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], he couldn't react to totsuka for this reason [
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] and with Minato's speed combined with his FTG teleportation speed and sage sensing will allow him to hit