I love how nobody can debunk nik's claims thus resorting to ad hominems.
Anyway, in fight against Imu, Loki hasn't shown anything that Zoro can't do.
If anything, Imu let himself goes distracted and thinking of someone else against Loki. While he never let himself distracted against Zoro.
Imu can tell which 1 more dangerous among the 2, he can't let himself distracted and eating blows from Zoro, same way Nusjuro who didn't mind being punching bag throughout the arc suddenly became cautious and blocking Zoro's attack.