Re: Selection effects...
Therefore habitable moons in systems with Jovians in the ecosphere are entirely feasible. In the Capture theory of planet formation systems of regular moons are caused by tidal distortion of the initial protoplanets - a mechanism that is quite efficient at making large moons around near-in Jovians.
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We have no evidence that rocky core planets (those with a magnetosphere to shield biologicals from the Jovian's rad belt) can form around a Jovian. But let's forget that scientific detail.
Ask yourself, just how many Jovians in resaonable circular orbits in the habitable zone have been found around the >1000 stars surveyed. We have this data. Answer: they are RARE.