Inside the Roche limit (2.80 planet radii): torn apart into a ring system.
Moon 2receding0.50% - 14.9 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Tidal braking locked the planet to its moon: one face forever moonward.
Moon 3merged0.40% - 19.9 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
+5 temperature: large moon stabilizes the axial tilt - steady seasons+4 chemistry: tidal pools cycle wet and dry - a boost for prebiotic chemistry+5 magneticField: a large close moon may help stir the core dynamo (speculative)