Collins calls this a sociological interpretation, but I usually associate this kind of bargaining power-based explanation with microeconomics or game theory, not sociology. Perhaps I should expand my idea of what constitutes sociology.

All sciences are describing various aspects of the reality, but there is one reality, and all these aspects are connected. Asking whether some explanation belongs to science X or science Y is useful when we want to find the best tools to deal with it; but the more important question is whether the explanation is true or false; how well it predicts reality.

Some applied topics may be considered by various sciences to be in their (extended) territory. For example, I have seen game theory considered a part of a) mathematics, b) economy, and c) psychology. I guess the mechanism itself is mathematical, and it has important economical and psychological consequences, so it is usefull for all of them to know about it.

There may be the case that one outcome is influenced by many factors, and the different factors are best explained by different sciences. For example, some aspects of relationships in marriage can be explained by biology, psychology, economics, sociology, perhaps even theology when the people are religious. Then it is good to check across all sciences to see whether we didn't miss some important factor. But the goal would be to create the best model, not to pick the favourite explanation. (The best model would include all relevant factors, but relatively to their strength.)

Trying to focus on one science only... I guess it is trying to influence the outcome; motivated thinking. For example if someone decides to ignore the biology and only focus on sociology, that already makes it obvious what kind of answer they want to get. And if someone decides to ignore the sociology and only focus on biology, that also makes it obvious. But the real question should be how specifically do both biological and sociological aspect influence the result.