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I was playing around with wingfinger a bit and I think the problem with wingfinger is a lack of pegs.
pic related in particular just has 3 ports which means they're basically useless without being attached to something with at least 2 pegs, and the only things with two pegs are the pelvis, the chest, and the dino head.
Paleotrex on the other hand has at least one peg on every part, which means every piece can potentially be attached to a C.O.M.B.A.T. port