Himezo Model

The Himezo Model is a theory hypotheses to cause the ejection of the 3rd gas giant and the migration of the gas giants, and the distance between Zincron and Montri, named after Himezo Ci, it explains the trojans that persists around Montri's orbit.

Background
After the Rune Track Model, where the gas giants migrated outwards and developed a new resonance, with 3:2 and 112, this remained stable for the next 560 million years, which by then he inner rocky planets developed in the latter half. After NY Beta became a main sequence star however, Montri migrated outwards toward Zincron, this interaction caused the orbits to become unstable due to the broken resonance chain, eventually starting the Himezo Model.

Summary
Due to their close proximity and Zincron's eccentric orbit, Montri eventually swapped positions with Zincron, mostly due to the radiation blast form Ny-Beta pushing Montri further out of the system. This however, causes the 3rd gas giant to become unstable due to Montri, which was initially the largest planet taking control over it. After they swapped orbits, Zincron rapidly migratted inwards, settling at 6.2 AU form NY-Beta while Montri migrated outwards which caused the remnants of the protoplanetary disk to scatter outwards and causing the 3rd gas giant's orbit to become highly unstable which will eventually cause it to be ejected form the system. Due to this, The orbits of Montri and Zincron " wobble " due to the instability brought by the 3rd gas giant. The orbits eventually become stable due to Zincron's increasing size and mass which caused it to migrate outwards, eventually staying at 7.4 AU where it settles to this current day.

Controversy
Although this was the universally accept hypothesis by astronomers and schools, 4 teams of astronomers disagreed, due to the evidence of Toureno 3 showing that the orbits of the gas giants were stable ever since they were created. This evidence suggests that a 3rd gas giant never existed, and what's more likely is that the 5th rocky planet migrated outwards and eventually developed Zincron, this hypothesis is named " The Uri Track Model ". Although this is currently been disputed, The XAAC and GGA are currently investigating this and have sent out another probe named Toureno 4 in 2018 to gather more evidence to see which side is more likely. The XSA ( Xena Space Agency ) is currently supporting the hypothesis of the Uri track model, claiming that the craters on Romuous and Tourus are actually the remains of the migration of the 5th rocky planet. However, this was unlikely since it is extremely hard for a planet to migrate without breaking the resonance chain, which would've either sent the rest of the inner planets to collide with each other or be ejected into interstellar space.