Speaking of ocean, water is mentioned several times in discussing Titan but the hydrologic cycle analogue consists of various hydrocarbons.

But to the fourth point, I wonder to what extent radiation is a factor in mutation of biological material. It turns out Titan has a rather low surface irradiation coefficient due to being rather distant from Saturn's radiation belt, a weak induced magnetosphere (rare for moons!), and the ions are mostly water-based coming from Enceladus while Jupiter's radiation belts are largely sulphur ions coming from Io.