Also @Salah Eddine after reading the chapter I have to say you was right. Its indeed very similiar to Doflamingo - Trebol situation. Düring spoiler I didn't notice there was a flashback telling us the beginning of Orochis story.
Glad you agree, and Doffy isn't the only one he is similar to
I believe that Orochi is like Smaller Version of Teach and it explains why Teach is a D. but different than others
Just like Orochi (& his Family) is different than other Great Families, BB is the Traitor of D. Family
So yeah Orochi & Doffy were both among Ruler Families, then the Family was dishonored, then they lived in Poverty & as Orphans & then someone gave them Power & inspired them for Revenge and then they became Kings themselves
The Pattern here is that the Subordinate is the one who Inspires out of hate, and the Chosen One is set to have Revenge against the People he was once among them. Also Chosen One possess a Power that his People aren't familiar with (Wano doesn't know DFs & WG doesn't have CoC)
Which is kinda similar to Enel too, since he had a DF where no other Sky Islander had one, he was willing to destroy anyone except those who follow him just like Doffy & his Family & he had Revenge against his People (Destroyed Birka)
If we apply this on Im-Sama, then this could mean that Im Sama is Actually from D. Family, Betrayed them and was dishonored, Gorosei gave him Power (Empty Throne or National Treasure or whatever) and he is willing to have Revenge against them (Removing Light)
We can also notice that in each group, there is an opposition, Orochi vs Sukiyaki & Kin'emon, Doffy vs Riku & Kyros, Enel vs Gan Fall & Wiper, & finally Im vs Luffy/Joy Boy? & Dragon
So as you can see, there is always an Inspired Traitor (Orochi, Enel, Doffy, Im, Hody Jones .. etc) With Unique Power (DF, CoC, National Treasure, Drugs .. etc) who takes the Throne (Shogun, Empty Throne, King, God .. etc) from the one who deserves it (Gan Fall, Riku, Neptune .. etc) and defeats the Leader of Revos (Kin'emon, Wiper, Kyros, Dragon .. etc) while there is someone who died inspiring Good (Oden, Noland, Otohime, Corazon, Joy Boy? .. etc) and let's not forget the Promise/Prophecy ofc (Toki's Prophecy, Corazon's Last Words, Otohime's Last Words or Shyarly's Prophecy, Shandians Promise ... etc)
This is exactly similar to Teach honestly, he betrayed WB Pirates, replaced WB as Yonko & had a Plan since Young Age, have a Unique Power unlike rest of his Group which is Two DFs and defeated the ones trying to stop him (Payback War) who were inspired by WB who died and just like Orochi killed Oden, Hody Jones killed Otohime ... etc it was BB who killed WB and ofc we had WB's Last Words
Same thing will apply to Im Sama (Who is represented by WG & CDs too) who apparently betrayed certain Group before (Could be D.) to become Ruler, after he was inspired by Loyal Servants (Gorosei or CDs) and given Unique Power set to Revenge (Remove Light & Kill certain People), he will defeat those who oppose him (Revos Army), but he will be defeated by Pirates (SHs Alliance) who were inspired by Roger (Who was executed by WG themselves) himself fulfilling the earliest Prophecies & Promises
It's also worth mentioning that there are those Middle Men in every story that inspire Luffy and serve as connection between Luffy, Inspiring Figure & Villain who are Ace (Adopted son of WB who inspired Luffy who will take revenge on Teach), Shanks (Who was given Straw Hat by Roger who inspired Luffy to become Pirate King), Cricket (Who is from Noland's Family who inspired Luffy to find Golden City & ring the Bell),
Jinbe (Who was member of Sun Pirates & Royal Guard who told Luffy the Story to inspire him to defeat Hody & rescue Fishmen Island),
Law (Who made Alliance with Luffy to defeat Doffy since he wanted revenge for Corazon) & finally Momo (Son of Oden who asked Luffy to Alliance to defeat Orochi & Kaido)
This Pattern can be applied to Most OP Arcs (Water 7, Alabasta, Drum Island ... etc) and there are much more than just these Similarities, there are also Damsel In Distress Characters (Vivi, Rebecca, Shirahoshi, Nami, Robin .... etc) , Corrupting Product (SAD, Smiles, Rain Powder ... etc) & ofc an Object that is fought for (Golden City, Poneglyph, Pluton Blueprints, One Piece ... etc)
This also suggests that Im-Sama is also looking for One Piece which is big hint to God's Valley
Sorry for Long Posts lmao i just love saying all ideas at once in hope that u like some of them
I just wanted to explain in detail, that all One Piece Story follows a Certain Pattern that Oda uses
That's why he said once in Interview that when he started he only had Ending in Mind, the rest he just fills it with things that lead to that Ending, so he ends up making Mini Story Version of the Major Ending/One Piece Story