Smallville: Oracle And Vessel

The Oracle is Lionel and the Vessel is Lex. The Fifth Season ends. Why does each Season have to end with a cliff hanger, especially when it is not clear what is going down? Zod has possessed Lex? it looks more as if Lex has acquired Kryptonian powers. And how could that happen?

Jor-El calls Fine the Brain Inter-Active Construct. I think this is the first time that the name "Brainiac" has appeared? And is this the second version in which Brainiac is a Kryptonian artifact? Clark is finally working with Lionel against Lex.

Since Jonathan Kent died, he has reappeared three times:

in a video;
in Clark's Near Death Experience;
as imitated by the metamorph, Brainiac.