Why?
I prefer it this way. Surprises just to be surprises aren't necessarily good- but by them allowing William and Logan's story to fully flesh out- it allows us to draw closer to the characters. Most flashback "scenes" where they are "told"- are typically 1 episode max- so the characters don't appeal to the audience as much. You know the present day character, and it's more of an inquisition of how their "past" was. But to do it throughout a season simultaneously, you get to see the development of the character and a much larger arc. And that will lead to some "ah ha- thats why he xyzs", etc.
That's just my opinion though. I'm actually curious why you hope there aren't.