As you can see, their complexion is nothing like that of Ubada ibn Al-Samit. The problem is that the general idea today is that their complexion is the complexion of Ubada ibn Al-Samit and the pure Arabs of the past. Now look at the Saudi Arabs in the picture below. They are originally from Hadramout, Yemen.
Who looks more like the description of Ubada ibn Al-Samit - the people in the first picture or the people in the second picture? The problem is that people think that the people in the first picture look like the pure Arabs of the past and that the people in the second picture are not pure Arabs, but descendants of "African" slaves. The person on the left in the above picture is Abdel Rabb Idriss. Look at what someone on one of the Arabic forums said about him: