He escaped ID because he had flight abilities. Nothing was shown that he coated himself with surrounding and lifted islands.
You failed to grasp what I was saying. If he could levitate himself then doesnt it mean he can levitate and manipulate the air around him? If you're basing this off of how he lost against roger, then you should understand his conqueror's haki was out of this world. It could summon a storm out of the bkue when shiki invaded his crew.
BM recently put soul in that Tsunami wave. It was also shown that they can expand their size(Zeus n Prometheus became big). So if she put her soul in that island then Shiki can't do anything as his DF states that he can't float living beings except him.
Can she cover the entire island with her soul? She only covered objects in her island with her soul not the island as a whole, with her soul. As you know shiki can can levitate his ship filled with living crew men, which means he just needs to touch a non living thing in which a couple of living beings are standing or residing. Or he can create dense cyclones with the air and crash it towards her and she'll suffer similar damage as G4 luffy attack. Natural disasters are always far stronger than power buffed attacks, otherwise whitebeard's power wouldve been useless. Shiki's ability is similar to whitebeard's, twisting the environment after touching it once.
U also failed to grasp that BM has flight abilities thanks to Prometheus so lifting islands won't help Shiki.
How can you say that? Shiki doesnt have limits to how much heights he can lift an object nor how much heights he can lift himself. Even if BM flies up, he can elevate the island, water, air etc around him to cover big mom and attack her from all sides in all directions.
I brought this point since u said those guys don't need Haki. Their DF is enough.
Everybody needs Haki post TS to even stand a chance against Yonko's 4th commander.
I said that, after analysing the nature of thier abilities. Moria's shadow power allows him to turn sides with the shadows of other humans endlessly so any attack against him is useless. Moreover he can cut the shadows of a haki user by taking it tangibly, from which the haki user has zero defense. Haki is useless in this case. Since they cant manipulate thier shadows with haki only increase thier body perception and agility. Why do you think the shichibukai despite having no haki was selected to maintain the power balance? Because of thier unique devil fruits. Its like saying robin doesnt stand a chance against haki users, which is extremely ridiculous considering she can gouge the eyes of any tangible human by instantly creating limbs near thier eyes. Haki doesnt give you a defense for that. Certain DFs eliminate the very meaning of haki.
If he could do that then he would have never met with an accident in Edd war. Also it makes no sense. It's like saying BM can coat herself with souls she collected and can gain Intangibility.
Another thing is that those abilities won't work against BM. She stopped G4 punch.
Ok, she can simply cover herself with souls not merge herself with souls. Both terms are different and doesnt work in her case. While shiki can simply surround himself with all the environment around him after touching the land, water, air, fire once and create an almost indestructible shield and invincible offense by throwing all these projectiles which cover a wide area, at her. What happened in the Edd hasnt been shown clearly and its likely that roger's haki has been so powerful enough to suppress his devil fruit abilities.
and Conqueror Haki has never changed climate. 
