We still have Raftel. The way I see it: Sanji and Zoro won't decisively beat commanders until we fight Black Beard. The next opponents will be admirals, and then later Mihawk for Zoro.
I think the progression of commander level -> admiral level -> above admiral/Mihawk level is pretty natural.
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Notice that Jack is severely wounded before fighting Jinbei. I don't think King and Queen can be taken down by Zoro and Sanji unless they're hurt in some way.
We still need Zoro vs Shiryu and Sanji vs someone in BB's crew.
If they can handle Queen and King rn I'm not sure where the suspense will be when they fight Blackbeard.
Jacks injury just may be used to specify Zoan recovery. Just because he's out now, doesn't mean he isn't recovering and he will be handicapped later.
Also, Blackbeard broke out 4 of the worst criminals in the world, I feel like people forget that Avalo Pizarro, Katarina Devon, San Juan Wolf and Vasco Shot are powerful people who virtually have no ranking against current YCs because we've never been given the opportunity to compare. They could very well be stronger. Jesus could effectively be the weakest right now and we wouldn't know. Plus, their devil fruit accumulation so far is immense.
Remember that there are other escapees as well, which we might learn about in the future and help characterize just who actually broke out of Impel Down. These people were called silver medalists behind Whitebeard and Roger, they were leaders of their own who just couldn't match the pirate King.
We should remember this going forward because they are likely the focus (along with Blackbeard and his crew) after Kaido anyway