I can offer that Baha'u'llah has covered all these questions, and to me this answers your observation, to me our oneness is scientific, our diversity of capacity is also explained, but I thought it wise not to offer those explanations in any detail, but maybe you would like to discuss that?
"OCHILDREN OF MEN! Know ye not why We created you all from the same dust? That no one should exalt himself over the other. Ponder at all times in your hearts how ye were created. Since We have created you all from one same substance it is incumbent on you to be even as one soul, to walk with the same feet, eat with the same mouth and dwell in the same land, that from your inmost being, by your deeds and actions, the signs of oneness and the essence of detachment may be made manifest. Such is My counsel to you, O concourse of light! Heed ye this counsel that ye may obtain the fruit of holiness from the tree of wondrous glory." Bahá’u’lláh
There are many quotes as to why our capacity of comprehensive ability varies, but that diversity of capacity does not negate that we are One as a human race, a body of humanity.
Here are a couple of thoughts.
"And now, concerning thy question regarding the creation of man. Know thou that all men have been created in the nature made by God, the Guardian, the Self-Subsisting. Unto each one hath been prescribed a pre-ordained measure, as decreed in God's mighty and guarded Tablets." Bahá’u’lláh, Gleanings from the Writings of Bahá’u’lláh, p. 149
So we are all created of the one substance, but there is a pre-ordained measure, but the important thing here is how we go about balancing that in this world and this is a thought.
" Let none, therefore, consider the largeness or smallness of the receptacle. The portion of some might lie in the palm of a man's hand, the portion of others might fill a cup, and of others even a gallon-measure." Bahá’u’lláh, Gleanings from the Writings of Bahá’u’lláh, p. 8
Regards Tony