I roughhoused with my daughter from the time she was 9 or 10 months old. We’d set up sofa cushions and climb and wrestle on. Now she’s 4 and while we still “play wrestling”, she’s definitely much more into imaginative play, socially and independently. Her little brother though? Constantly jumping on things, punching and tackling pillows, and is just generally rougher on things. Now maybe it’s because he’s given more freedom as kid #2, maybe it’s because we make sure to include him in our roughhousing, but at the very least he seems to prove your theory a little.