re: They should have released Huygens later
This is just a guess, and I'm sure someone with more background will clear it up, but I can think of three reasons that the probe might have been released as soon as possible:
--Conserve fuel for guidance and attitude control. Every additional ounce of mass on the main probe reduces its useful lifetime.
--The probe may have been in the way of some instruments
--Worries about failures down the road as the system ages. Use it or lose it.
There will be a lot for the next probe to do. Too bad the Terrans don't do everything in threes...