If Lavos exists within a time bubble (a theory I had read about), after his defeat, would it mean he never would've existed from the first time period you are able to fight him in, onwards? Therefore disappearing from the Black Omen, or rather under it, causing it to sink or explode and the like, making the idea of a sequel impossible (outside of what Chrono Cross did) because there never would have been the need for the "entity" to set everything into motion, making everything from that point onwards different. So, Crono, Marle, and Lucca would never have met Frog, Robo, Ayla and Magus. At least a sequel beyond what Chrono Cross did, right?
(I am not the brightest crayon in the proverbial box, and there is a glaring possibility that what I just said is absolutely impossible, or have been explained before, so please go easy on me, I'm 16 and I have no background in Quantum Mechanics [I'm pretty sure that's the field that applies]. Thank you.