Dave, Steve,
Thanks for trying!

You essentially speaking of same thing. It would work, if lets say one set of files was recorded at 100BPM and the other at 105BPM. I can see that stretching would work... In my case, I believe it is exponential. It is sort of Fibonacci effect.
If it was one time deal, I would slice and dice the "thing" into 4 bar sections and just align everything, but it is far more than that.. I have many things already arranged in that software, and hopefully will be using it in the future. Just have to find the right method/workflow with BIAB. Tempo map, certainty sounds interesting.

Misha.