Yes, Zoro got angry & decided to use a Technique without first deciding the appropriate one,
You think Zoro wins by unleashing Attacks stronger than previous ones? Not necessarily, He must select which one fits the situation,
You think Sanzen Sekai for example would have worked against Braham or T-Bone or Kaku or Daz Bonez or Ryuma? ... etc
Stronger Attack doesn't mean it's the right Attack to Use, it depends on how will Opponent answer,
Zoro was reckless, He didn't expect Imu to block with his Tail which made Zoro open for a free attack from Imu's Hands & that's what happened. Compare it to how Sanji was dealt with, Imu blocked with his Leg & then He attacked Sanji with his Leg as well, why didn't Imu finish off Zoro with his Tail? Instead, He made it clear that Zoro left himself vulnerable for a free attack & got severely punished for it,
Hawk-Eyes Relevance? You literally just witnessed this Imu emerge from a Double-Layered Eyed Host, and you still doubt Mihawk?
Do you know when did I say that "Real" Greatest Swordsman Mihawk is not the body We see but who's living inside him?
And Zoro confirmed it by saying that S-Hawk looks less human than Mihawk,
I also said that Mary Geoise Knights specialize in Gentle Blade (They are Extremely Fast) just like Hakuba, isn't that what Nusjuro, Shanks, Brook and now Imu just confirmed? While Elbaph Giants specialize in Strong Blade,
Mihawk is Ultimate Swordsman who perfected Fusion of Gentle & Strong Blade,
Also, if Oda didn't want any comparison between Imu & Mihawk, He shouldn't have given him a Blade & made his decision to act quick is to cut his Opponents, and if He is better than Greatest Swordsman, why did He summon a Cannon to free Gunko rather than just cut the Ice?