Heck, looking at Dante, this fellow astounded the world and caused whole powerhouses to risk their lives to capture him because he went from F to E in 10 seconds. Yet from E to D, he spent an entire week in the Black Land and only reached 75%.
You could be sure as hell that even Humphrey and Slessor, who managed to reach the E Rank in relatively good times, were not even 10% of the way after one whole week. They would probably only reach the D Rank in their second year, and that was considered astounding fast.
This was why Dante absolutely needed the Zero Gate of his home universe if one existed. Not only could he suck energy 24/7, but he could also obtain all ten fruits and swallow them. Unfortunately, 10 fruits did not mean 10 superpowers, but ten chances for a superpower.
Otherwise, there was no way Lara Sanguis, the headmistress, would have only 7 of them despite being virtually the 'owner' of the Eternal Universe's Zero Gate.
