What I was trying to get across is that they don't need to follow SC1 to the letter (hell, if so then it would be SC1)
They probably have an explanation for why that works somewhere in the description, I haven't read it in detail...
Different reasoning--
Don't forget that a Science Vessel would more than cover the screen if it was to-scale, to properly represent sizes in SC1.
However, it didn't. Why? Gameplay first, to a degree.
In this case, they become much more versatile when you can use any combination of templar to form them.
For the moment, Just_Spectating, MC is removed. (It's mentioned in one of the later Q&As in a "why did X ability get removed..." question), but you never know, they may do a 180 and put it (or even DAs) back in.
Archon-Twilight Archon-Dark Archon all together would be awesome - Have both extremes and a compromise.
Or maybe a TA with Maelstrom instead of Feedback... more of a hunter-killer than a sniper, would be nice as well (in different situations)