Remember, we saw a whole lot of Ba'al's die from the symbiont poison, which means he clones the snake as well as the body.Ah, but it was completely forgotten in Continuum.
You mean Ba'al putting "himself" in Adria ? That's just misdirection on Ba'al's part.
How else did the Ba'al symbiote get into Adria?
Basically, what I'm saying is the "original" Ba'al symbiote has died twice. Once in "Dominion" and once in Continuum. That bothered me only a whole lot.

but then again I feel the same for all of us. There is nothing in the series finale that will make it settle well as a series finale because its supposed to be a cliffhanger type season finale so no clousre of any kind will get given.