Yeah, no, I didn't reply seriously since you didn't even read my post. I never said Marco's Haki>Jozu's, or vice versa.
1. Like I said, he was singled out because he was WB's right hand man. He was the most notable. Shanks asked him to join his crew as a joke because Marco called out to Shanks. Marco was simply the one that stood out most, doesn't make him the strongest. Key example of this, Usopp stands out the most to Doflamingo right now, due to having that immense bounty and all five stars. Does that mean Usopp>Sabo/Zoro/Luffy/Law?
2. Yeah, they were one-shotted, as in, both were put into critical condition because of one hit. Marco was able to continue fighting due to the fact that the attack he took was limited to the two wounds on his chest and back, which healed. Jozu on the other hand took a more devastating attack. If Marco was frozen, he'd have been out of commission as well.
3. It still makes no sense. Jozu has been portrayed as a no-nonsense guy, there's no way he'd let himself be stalled while his friends die around him, even for brief moments of time, because his enemies are having a conversation he has no interest in. Let's use your logic, if Jozu could have broken out, why didn't he?
4. Still failed to supply irrifutable evidence that indicates this.
5. Because Shanks is a Yonko, while Jozu isn't. His Haki plus diamond coating his fist wasn't even enough to put down Crocodile or do significant damage, but it's gonna be on the same level of a Yonko's? Please. Jozu breaking out is the true fanfiction, he was unable to do so.
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That vein on his head is an indicator of effort, meaning despite effort, he was still restrained by Doflamingo.