Well done friend!!! I am amazed by your theories and details!
Your points and plots are spot on. Although I dont have any problems with the Prophecy angle, it could have been made better. I agree with you that StarCraft story is all about the space-themed military theatre of war type with betrayals, nightmarish wars and constant loss of important characters just like SC1 but if they want to build a Xel Naga Prophecy story, they should do a more darker, mature and militaristic story rather than a hollywood casual romance angle with Jim and Sarah.