What about the dumb things they never did?
Think how many hand-held dracon weapons they've had at their disposal to just take and use. Marco and Ax can even use them while in standard battle morphs.
Think how many times they could have morphed Hork-Bajir, marked each other somehow for mutual identification, and then gone into battle with those forms as concealment as well as muscle? Yeah, other Hork-Bajir might recognize them... but they might not.
Think how many times they could have learned the Frolis maneuver and used it for concealment, too. Demorph, morph somebody else partially = nobody can ID you as the same human.
Also, killing V3 and V1 simultaneously would make a power vacuum. Ugly for us down here on Earth, since V3 was what was preventing open war.