[quote=@Flamelord]
<Snipped quote by Gentlemanvaultboy>

Note that humanity is going to go down HARD here. Like, multiple Alaska Cannons. It was the cultural infection of the Zentraedi that motivated bringing in the main fleet that toasted Earth in the show, and if that takes longer, then Earth as more time to prepare and build up defenses. Maybe not enough to win, but they're going to be able to do quite a bit of damage. 
[/quote]

Probably enough to kill most of the sympathetic Zentradi we meet in the show off before the main fleet shows up and buries the human race. Win/Win for the Shadow Line.