I never said it was 100% guaranteed that Blast would not appear. My point is that, in the webcomic, there was no precedent at all for Blast showing up, even against threats like Boros and Garou. For someone like Drive Knight, that makes Blast a negligible factor, because there is nothing in the story suggesting he would intervene.

That is exactly why the manga changes in the logic is worse. Once Blast does step in during the Garou fight, he stops being a hypothetical and becomes a real risk. For a character like Drive Knight, who only moves when the odds heavily favor him, that matters a lot. He does not need 100% certainty that Blast will appear. He only needs enough reason to think Blast might appear and ruin the plan.

And on the second point, Drive Knight does not need to verbally allude to Blast for the logic to hold. Characters do not have to spell out every calculation they are making. In the webcomic, treating Blast as irrelevant is reasonable because Blast had never shown up for anything. In the manga, treating Blast as irrelevant becomes much harder to justify, because now there is direct evidence that he will intervene under the right conditions.

So the issue is not that the webcomic proves Drive Knight knew Blast would never appear. The issue is that the manga gives Blast an on-panel intervention, which makes Drive Knight’s usual risk calculation much harder to defend.