CATDOLL : CATDOLL: Why do bees always choose the first spleen?

This is because bees have the characteristic of gathering on the edges, that is to say they will stay on the edges, because only on the edges can they find a foothold, that is, on the first comb you mentioned. Only when the number of bees increases and the first comb is full of bees will they go to the second comb. This is why you cannot add combs blindly. Adding too many combs will only make the bee colony weaker and weaker, and even cause harm because there are too few bees and they cannot protect the combs.