If anything, I say Mort's patella is pretty much right. The other skeletons are using a mid joint position which is only characteristic of the flexed knee, where the patella protects the anterior cartilage of femur and tibia. Of the tendons attached to the patella, the lower tendon inserting into the tibia is the major determinant of where the patella locates during flexion of the knee, essentially maintaining its distance relative to the top of the tibia, rather than any reference point on the femur.

Reference image chosen for best compromise of position and tendon references with a quick google search:

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