A few points to keep in mind when discussing this.
1) What is the definition of עצמותו ומהותו, don’t forget, that in Chabad אור אין סוף and אין סוף are distinct entities. I.e. define מכוסה and מופלא.
2) What does it mean that ever נשמת אלוקות is a חלק מאלוק ממש, emphasis on ממש.
3) Regarding point 2, how can there be many ‘levels’ of נשמות if they are all אלקות.
Answer these points then you should have a clearer understanding of the topic.