When he spotted lurkers and build double robo, I was so on board with the Disruptor Hype - and then he builds immortals? I mean, yes there were some roaches too, but guess what also explodes those?
Mass immortal is better at preventing lurkers burrowing on your army, and you only need to chip with 1-2 disruptors if they play turtle. But you can build a robo bay then and still go mass immortal.
you need to get all the twighlight council upgrades with the three forges and mix in adept-mineral-line shades until the lategame for a real gateway man