Now we also have to consider, though, that Jirou was at the level of being able to destroy Toriko's planet Earth WHEN HIS SEALS WERE STILL IN PLACE. Most likely, with his seals released and him in Rampaging Beast form, he should EASILY be at large and/or multi-planet level as far as this wiki's standards go.
He has stated that Ichiryuu was most definitely more powerful than him. And several characters have outright stated that Midora could not just destroy the planet, but could do so EASILY. So yes, all three of Acacia's disciples should be upgraded to tier 5-A, in my opinion.
Also, I thought our scale required a large planet to be about 500x Earth size, correct? Now is that in terms of volume/mass, or in terms of actual linear scale? Because if it's the former, then the planet in Toriko should actually qualify just fine. . .