He definitely was.
I was surprised by how relatively little comics work Lightle did over the last 36 years. Outside of his LEGION work, he often suffered from inkers whose style was not compatible with his, and mask his decorative linework. But his LEGION, DOOM PATROL, and DETECTIVE 400 work are beautiful examples of how good his work is.
I wasn't aware Lightle did work for Marvel till now, and I noticed he did a long run on MARVEL COMICS PRESENTS, hopefully some other great Lightle work to explore.