If you look, you will see that the WG port comes off in the direction of exhaust flow, while it does then turn before going into the wastegate - it is not like your "option 4"
There are many cases when decisions need to be made in the design and concessions made in the name of packaging into the vehicle, ease of installation and service, reliability and heat - those are only some of the factors that I used in the design and build of the kit.
That being said, the WG design has served this kit well - however the diameter of the port and the WG size will soon be updated to support the newer, faster spooling turbos etc. that some people want to run on this kit.