Hmm, isn't it possible that the Uprighters and the Non-Uprighters had the exact same amount of dexterity, and the only difference between them (in terms of their hands) was that the Uprighters had free use of the hands and the Non-Uprighters did not?
... hands than did the non-uprighters. In fact that ... the hands, and the non-uprighters were able to ... more dexterity than did the non-uprighters. Now, if ... no more dexterity than the non-uprighters] implies that (ii) ... use of hands than the non-uprighters]. But (i) ...
... differentiate. An early upright and non-upright prehistoric human ancestor had ... where hands were on the non-upright crowd. They would mostly ...
The whole goal of that statement is that you show how you will bring a non-majority point of view to the classroom. If you honestly feel that you can bring that to the table, then go ahead!