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: 
> 
> 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.

> 
> 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.
> 
> 
> 

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.
> 
> 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)
> 
> 
> 

There is no science which supports this claim.

> 
> 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?
> 
> 
> 

There is no science which supports this claim either.

> 
> 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?
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Yes? No? The answer doesn't really exist because real fitness studies are multivariate. You suggest there is a strong correlation between body fat and muscle mass but reality is much more complicated.

> 
> I'm guessing this means bulking is just an excuse to lazily gain muscle without paying too much attention to the surplus of calories you are eating.
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MJB's answer did not suggest this. Food consumption affects the way muscles grow (and even atrophy) and bulking is a viable fitness strategy.