Indeed, Kubo is that good, even the small story about the witches was actually super well done, loved London in that manga!!!!
Kubo is great when it comes to working with short/medium stories who take a straight forward approach and linear storytelling.
He lost his touch after soul society when it came to the plot due to his inability of working with long arcs whose payoffs will only come far in the future which is something that oda excels at.
Soul society arc, turn back the pendulum and even fullbringer arc(i realized how good this arc was after watching it as an adult and realizing all the nuances towards ichigo's character) are his best work exactly because they follow the same structure used in burn the witch.
Fake karakura town, TYBW and hueco mundo SUCK because kubo needed to think outside the box and work with several characters and plotlines at the same time, not to mention the complete absence of a power balance lol.