There's no reason why we can't compare one arc with another arc in the same series. We know how shit works with Oda, and it doesn't go in line with your line of thought. I've got nothing against Akainu going down in the same arc as Im, and I have always been on Akainu vs Luffy train. The issue here is you trying to have it all knowing full well that you won't get it. I know the goal here is to establish that Akainu is above everyone who comes before him(Kaido, Kizaru, Blackbeard, Shanks, etc), and you know pretty well that Akainu won't get recognition that you're trying to give him as a major final antagonist if he's gonna be Luffy's Blueno in the final war.
I did not miss the point. I know what you're trying to say but you have to look at both sides of the coin. You can't just say similar things can happen to two characters without them being in similar situation. You may actually genuinely believe Akainu would put top-tier Luffy in such a condition, but we have no reason to buy that idea without solid evidence especially when it took two people on Akainu's tier to do what they did to Zoro. Dude's strong and all but the series is not Akainu wank fest lmao.
Doesn't change anything. If Luffy's strong enough to fight off weapons that can wipe out islands, he dog walks OP's top-tiers, and Akainu's just one of them.