Rhyme makes rhythm, so the speech flows together, and sounds rather nice instead of choppy.
Answer:
There will be no answer until I can grasp evidence.
Explanation:
Why do I need evidence? Because, evidence is needed in order to help you answer the listed questions you asked. Please provide the text you are reading for a better answer.
This is an opinion oriented question, just use your imagination. No one can "Answer" this for you.
I'm pretty sure it's a spelling change in the word since when you add a suffix to a word the original word is no longer the same.