I think I’ve stated this before upthread, but it’s perfectly possible for God to have levels of “greatest” and “least” in the Kingdom of Heaven based on merit, but not prioritize intercessory prayers.
There seems to be some concept on this thread that a saint having greater merit means that the saint’s intercession would be more efficacious. Apart from our Mother Mary, who is recognized in Church teaching as having a very special connection to Jesus as well as being the only sinless human ever, there is no teaching or evidence that a particular saint has more powerful intercession than another saint.
It’s rather disturbing for someone to be going around saying “Who’s the most powerful saint, so I can ask their intercession?” The great saints who, while on earth, chose to ask the intercession of certain saints in heaven didn’t choose their intercessors based on this concept of “who’s the most powerful saint?” They chose a saint with whom they felt a personal connection for some reason. Furthermore, calling one saint more powerful than another is verging on prohibited voodoo practice. All saints are just praying with us, to God. They don’t have powers of their own. Whatever they do is God working through them.