1) your scan is of nagato being totsuka'd - so i'm not sure if you're subtly saying itachi > nagato? lelWho said it was invincible?
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From this scan we can occur that Itachi's was the first one to strike CT, did it explode? No, it took the combined might of all three attacks to destroy it. Your argument is invalid
CT > Itachi (common sense)
Edit: Chibaku Tensei was never destroyed twice. Naruto just magically appeared out of it (plot)
2 if you go back, the Tbb is ahead and we never see which attack hits first. Don't know what you're trying to make up here.
Naruto broke through it and then exited, not really plot. It's called beating the jutsu.