I realized recently that fusion and combination is a rather common occurrence in the Matoran Universe. Not only with the toa kaita, but even with the Matoran. In Trial By Fire, the six matoran simply needed to concentrate on their unity to form a Matoran Nui.
So clearly fusion is something the Great Beings thought necessary to incorporate it into the majority of the MU population. My question is what exact purpose or purposes they had in mind when doing this?