Virus complementation & disease

Some of us use virus complementation by tumour cell as an approach to treat cancer. But this paper in science suggest that different dengue virus serotypes can complement each other... The introduction of defective virus that need coinfection to spread could be useful if they are stable enough to propagate efficiently in the population. Could we use them as a tool (in mosquitoes, not humans)? If we make a virus that replicates faster because it lacks capsid components, can it overtake a population and eventually make it crash when it reaches a certain treshold. Kinda like fighting fire with fire...