I am personally more invested in Imu than Blackbeard but couldn't care less if Blackbeard turns out to be the final villain if Imu turns out to be a great villain with a statisfying conclusion.
Remember that in shonen manga, it is rare that the final villain is considered among the greatest, a big factor to that is that sadly, most shonens end in a underwhelming way.
Remember that in shonen manga, it is rare that the final villain is considered among the greatest, a big factor to that is that sadly, most shonens end in a underwhelming way.