Stop making shit. Nobody said Pica > Roger but yourself and your troll friends.
Delusional Cracker-Lulffy-Big Mom-Katakuri wankers, even King Elizabello whose Punch can KO a Yonko like Big Mom, still being told by Zoro not to use it against Golem Pica.
Admit it, King Punch will KO Yonkos, but Pica in his Golem has chance to actually survive from an attack in that scale.
Blah blah. Stop comparing heating water in ocean with heating rock. Rock needs far higher degree to melt than boiling simply water.
And that's just the outer layer of the rock. We're talking about a mountain sized rock here. And Pica is residing in its core.
Now you wanna say Oven can melt mountain lol? He will get punched and flattened during the process.
p.s.
If anything, Oven isn't immune against heat (shown when Ichiji attacked him). Oven can try heating the golem, but it will only power up Golem punch even more. Now not simply a rock punch anymore, but Fiery Rock Punch.
RIP Oven.
Never said Oven and Perospero are stronger than Cracker, again stop making shit.
Pica > Cracker > Perospero > Base Pica ~ Oven.
Who said Cracker is stronger than Pica's boss? No one.
Prove Cracker can defeat Pica first, with serious arguments. After that we can start discussing the nonsense of Cracker vs Doflamingo.
If anything:
Cracker vs Doflamingo?

Cracker vs Pica?
Katakuri vs King?

Katakuri vs Doffy?
Big Mom vs Kaido?

Big Mom vs King?