Question: If you are heavier you will be stronger wether this is by fat or by muscle I think we can all agree on that. (I'm not talking about overly fat because at that point it would probably not hold true due to health reasons)

So if you have excessive fat, will you gain more muscle because you can lift heavier then the version of yourself who has the same amount of muscle but a lot less fat? Or am I missing something here?

Scenario:

Say there is a version of me of 70kg with 10% body fat and a version of me of 80kg which has the same amount of muscle mass but higher fat percentage. 

Both training the same exercises but lifting the most I can lift in a secure way, will the fat version gain more muscle mass?

Answer: 
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> If you are heavier you will be stronger wether this is by fat or by muscle I think we can all agree on that.
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On what do you base this? Apart from very few lifts where a bit more body weight helps you, I can't see a scenario that shows having extra fat helps you lift weights.

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> Say there is a version of me of 70kg with 10% body fat and a version of me of 80kg which has the same amount of muscle mass but higher fat percentage.
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> 
> 

No, absolutely not. If you literally only gained fat, and no muscle what so ever, you won't be stronger. (unless your central nervous system somehow adapted in such a way that you have more control over the lift) What often happens thought, is that you have gained some fat and some muscle, making you a bit stronger.

**The reason why you often see very strong dudes have a bit more fat** is because if you want to be strong, you have to eat a lot. Eventually you get to the point where it gets harder and harder to gain muscle without gaining fat. They don't intentionally gain fat, it just happens when you get to the point of eating x-amount of calories a day.

Also, don't confuse muscle size with strength. You don't always have to lift heavy to get bigger muscles. Training to get stronger is different from training to get bigger.
Most sports require lean performance as fat adds nothing but sport baggage. Good 40 yard times and slam dunks require it. IF you push your fat percentage below 5% other organs including the immune system will be compromised. Many Olympic performances have not gone as expected for this reason. Sumo wrestlers, cannon ball targets and cold water swimmers are special needs events and are associated with specific health related compromises. For the average human, gravity is a daily reality that fat as baggage creates passive exercise, still low body weight is associated with longer life expectancy and generally greater health. Dietary fat generally concentrates man made contaminates, cholesterol, and has lower satisfaction of hunger per gram eaten.
Elite athletes often increase the duration of peak performance by managing fat intake.