The powerlevel discussions pretty much started because:
- Mihawk tried slashing WB and Joz blocked it (que Trolls)
- Mihawk and Vista clashing
- Marco hit Kizaru a few times and blocked those attacks
- Joz made Aokiji bleed
- Whitebeard curb stomped Akainu after killing Ace, whom he defeated easily.
- Ace by virtue of his power could hold off Aokiji but not Akainu, fanbase argued about that repeatedly.
- Luffy being fundamentally powerless for 30 chapters and received help (was a good thing)
It just Jumpstarted a bunch of ridiculous discussions about powerlevels all because Oda wanted to tease upper tier characters and their strength, to gear us for the New World plotlines.