Switch shadowstep with leap and some other stuff

Can someone please tell me why fade and onos upgrades are available at biomass 2 and 3? If the marines stomp back the aliens to one hive, how is shadow step and charge going to get the aliens back into the game? I think leap and umbra would be better. I'd like bile in there too, but early game one hive bile would be too much.

So I moved things around to suit my opinion and them some. It just makes better sense.