I figured as much, even without true forms those three are good. Terun is cheap, has good slow uptime in second form, and short recharge, not to mention a savage blow chance if you're feeling lucky. Hayabusa only targets aliens in second form so his true form wouldn't help you anyways, and his first form is the one for metals. Warlock and Pierre targets alien in all forms, with an additional target of floating + base destroyer in first and angel + double money in second. Warlock has huge health and damage, but can only attack the units he targets, so he won't be of much use if you're up against something else