1. When Law talked about Corazon, the silhouette shown had a pointed chin
2. You're telling me Doffy went from a round chin as a kid, to a pointed chin, then back to a round chin?
3. It's clear that Moriah isn't a normal human by OP standards, so his physiology cannot be applied to Doffy's. Mihawk, whose physiology can be compared, retained his face's shape, so that's a moot point.
4. Was it ever stated it was Doffy, or that it WASN'T Corazon?
5. Oda has set up future plot points wayyyy before they were introduced in random ways. Camie and her starfish were shown in covers all the way back in Alabasta, for example.
It can be revealed that Corazon was never dead, just like Sabo.
1: No, as I already stated, that is not his entire chin, it falls behind the Boa. Otherwise his chin would be pointier than Chinjao's head.
2 and 3: Look at kid Kuma, he was round as shit and he has the biggest chin in the series now. Those gimmick kid shichibukai pictures can't be used as any evidence for facial features.
4: No, but neither that it WAS Corazon
5: You don't have to tell me that. But it's soooo unlikely that Oda would set up for a plot twist in a special chapter made for a movie. Where he made the young shichibukai watch Rogers execution. And you're telling me that he already swapped out Corazon with Doflamingo. How stupid is that ?
I rather believe that the silhouette is Doflamingo because he wears the same clothes, has the same smile and wears the same glasses. Besides he looks like the Doflamingo that Oda shown us when he was young. Rather than Doflamingo has an almost identical brother who also wears the same clothes.
Hearing what Law said, Corazon was a different kind of guy. So I doubt he would be as flamboyant as his brother with the pink boa and all.