Regardless of he fact that it's AAT or HAAT. Yes, Zavage can solo phase 1 of HAAT. I actually ran my maxed out Zavage earlier today on an HAAT phase one. You definitely want to drop Health mods on him. Defense are also extremely helpful due to his leadership ability. You can stack up the defense on him and make him virtually inpenitrable. If your looking for quick work with him, add offense mods by all means. I run him with 2 defensive mods and 4 health mods, sacking on his defense. One very important thing to remember is that with Zavage, speed does not matter because if GG attacks him 3 times he is already going to have 90% turn meter due to his "Brute" ability. A good way to see him is to make sure that his health is over 28,000. In this instance protection does not matter as it will be shred away relatively quickly. Hope this helps, if you have questions feel free to ask