Exactly right about the frame/bone structure test. The test works for around 80% of people, but like in any tests, there are outliers like the person in this thread where it didn't fit.
The ideal weight for big framed runners is higher than for average, with small framed runner needing the lowest weight. We are talking here about 18 BMI vs 19-20 BMI vs 21 BMI depending on frame size for a 5k guy of same size. Think about all these 6'2" runners:
Kiprop -> Jager -> Mottram -> Solinsky (from light to heavy). Now Solinsky was 6'2" and his best race weight was 157 lbs. General population would still think that he is a skinny stick! That's how weird the general population is. He just seems massive because well, compared to other elite runners, he truly is. But put him next to a lineback or someone and he will be the stick.
About the sit-and-kick - this is not really dependent on frame/bone structure, but more on muscle fiber distribution between ST and FT. Lewandowski and Coe were both extreme fast-twitch runners in the 1500m (they would be ST in a 100m ofc, that's why we have to look at each event), bot Lewandowski is a heavy guy (20.0 BMI) and Coe (17.6 BMI) was a tiny stick. But both just had a very high percentage of fast-twitch fibers compared to other 1500m runners.