4. Sensing all of the rubble in Dressrosa and levitating all of that rubble while not harming or levitating the civilians present among the rubble
First of all I don't think we have seen anyone ever being more subtle with a DF. WB on that level of subtlety would be causing quakes that only but only break a porcelain glass in an ant's home 5km away.
And his extraordinary implementation of CoO to differ between living and not living makes the feat really insane.
Fujitora was really underestimated for so long, only bc ppl were hyped for green Green Bull. Who ironically turned out to be a Green Cow.
Regarding your question. He's probably top 5. Due to 2 reasons. Since he relies 100% 24/7 on his CoO, he basically has the most experience using it and it probably feels more natural to him. Secondly, his fruit really complements his CoO. Most likely he can feel gravitational fields and thus objects that penetrate them. He basically has CoO premium package. This combination puts him on top 5.
But we haven't seen a hint of adv CoO. Also there's at least 2 (Shanks, Mihawk) people around who'll have higher CoO stats than he shows. Add EoS Luffy and Zoro into the list and we'll have Fujitora at 5. Best CoO user in current time.