[Avodah] Wording of Kaddish

[ramiller500 at aol.com]

Being new to this list, I don't know how exhaustively this may have been discussed before, but, anyway, here goes:
 
1.  In the Kaddish, when, where, and by whom was the earliest known use of these word forms? (pardon my layman's orthography)---
 
a.  Yisgadeil
b.  V'Yiskadeish
c.  Tiskabeil
d.  Any others heard in some shul(s), where a tzeire has (seemingly at least!) replaced a patach
 
2.  What is the most scholarly rationale for any or all of these forms, given by those who use them?
 
3.  What are the best counter-arguments in favor of using a patach in these situations?
 
Thanks!
 
Sincerely,
Bob Miller
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