I have been away from the forum for a while so I am not up on the post you reference. However, I do know the answer to your question/problem. You should have stopped when you pulled the first seal. I do not know how long it took you or how hard it was to do it, but you removed the seal from the sealed bearing behind the "mechanical seal" which was the impeller shaft seal. I have not read the book for the replacement of the sealed bearing and do not know if it can be replaced without splitting the case. I suspect it cannot. What you are seeing are the actual roller ball bearings inside the sealed bearing. That is what keeps the impeller suspended in place, moving freely and the coolant and oil away from each other.
On the plus side you may have needed to replace it anyway and now you know what the inside of that sealed bearing looks like. Some are roller bearings not balls.
No Brain - No Pain. I measure a man by the good he does for others, not his mistakes.