I would say it is a lot more to do with genetics than diet. I've had the same diet for both of my DDs, I was 55kg before DD2s pregnancy (BMI of ~19) so a healthy weight. DD1 was 2.9kg at birth, gained slowly and is still tiny... DD2 however was 3.8kg at birth and has been putting on 400g a week! At 5 weeks she is the size DD1 was at 3 months.

My DD1 fed 2hrly around the clock basically right up to her 2nd Birthday too, even when she was consuming large amounts of solids which makes me think she just inherited a fast metabolism and small build. DD2 already goes 4hr stretches. From that experience I can't imagine it is easy to overfeed a breastfed baby because otherwise my DD1 would be huuuuuuuge (I always took the easy option of feeding back to sleep through the night, there were even stages it felt like she was attached all night as we co-slept) and as I mentioned, you can't exactly deny them food when they are asking or make them eat when they aren't interested so what is there to do but trust them?

Would also still be interested in seeing a study about it though too!