>> 6. Metacarpal-phalangeal joint, maximum extension 15f or less (metacarpal
>> distal extensor pits absent), above the horizontal.
>
>If only I had theropod manual phalanges to experiment with...
I just looked this up; Barsbold, 1976 fig. 7 has a dorsal view of
the Therizinosaurus metacarpus, which appears to possess a typical theropod
dorsal "extensor pit".