Here’s a fantastic write up about the benefits of the blue zone. Ultimately it’s better to saturate than use the blue and go 2/3 in terms of income, however there is some value to be gained depending on the map for going 2/3 main and 2/3 nat before saturating them both if the blue is brought over.
I personally still see it as better overall to push forward over my partner. Especially as later on in the game I’m not going to have it on blue unless I’m moving units around generally.
However Signal Savant may twist the numbers around enough to make it valuable early game since the spread over would technically be 50% faster. No one’s looked into that as far as I know though.