Go in by the Hive Seeder, and have a Bladedancer with you ( for emergency cloaking revives), and have both of you hit him with the strongest thing you have (use Synthesis's frivolously) Hope this helps
Can he grow? I mean, all the implants probably should prohibit his growth, and even if HE did grow, how could his armor? As far as I'm aware, there are no Spartan Armor Tailors.