Inside the Roche limit (2.80 planet radii): torn apart into a ring system.
Moon 2merged1.0% - 12.4 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 3receding1.4% - 11.4 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Tidal braking locked the planet to its moon: one face forever moonward.
+5 temperature: large moon stabilizes the axial tilt - steady seasons+10 geology: tidal flexing sustains geologic activity+5 magneticField: a large close moon may help stir the core dynamo (speculative)