The fact that he will explode and that power will take out the city it doesn't seem to phase him. It actually made things more exciting in 'his game.' He fought the Abarangers, using their stolen DinoGuts to revive his partner TopGaler before recruiting Stego to their cause. In Episode 29, he even assumed leadership over the villains at Lije's request. He wears Asuka's Dino Harp around his neck taunting the Abaranger in episode 33. His evil tendencies come from the fact he is the indirect demon seed of Dezumorlya by evolution. This was discovered after fighting the Killer Giganoid with the Abaranger. This also caused Mikoto's horrible childhood. Dezumorlya originally divided himself into the two earths and has to heirs (Rijewel and Mikoto) which have his evolutionary essence in them. However, Mikoto, furious that he was someone else's pawn, decides to refocus his game on the Evolians. He has only has a few transformations left in the Dino Minder before it blows up, but the reason the Dino Minder hadn't exploded yet was because the Dezumozorlya within him has been keeping it at bay.
Eventually the Dezu spirit (the Wicked Life) will come out of Mikoto. By episode 42, Mikoto needs help now, he is feeling bad. Stegosraidon has grown to care for Mikoto and went to our heroes for help. Soon after Dezumozorlya was removed from him, his Dino Minder was set to explode the next time he transformed. When Dino Minder began to self-destruct, he and TopGaler flew away from the Earth and both died in the explosion. In 'Dekaranger VS Abaranger,' he was revived by SaunaEelGingko's power and helped the Abaranger and Dekaranger for a short time. As he vanished after the enemy was defeated, he told Asuka to give Kasumi his regards.