What do you mean? I don't know about Decrepit Birth but Origin is stock full of absolutely awesome solos. Some tech death metal songs sound like one gigantic solo anyway.
most of the origin i've heard doesnt have solos. i mean - they have sweeps in parts of their songs - but - i wouldnt call those solos - those are more riffs, cause they repeat (i have songs like Staring from the Abyss, and The Aftermath in mind). but ya - their stuff is more like one gigantic solo, so - to throw one more in just for the sake of having a "solo" in there would just be a waste, y'know?