"De Raadt says BSD could have become the world's most popular open source operating system, except that a lawsuit over BSD scared away developers, who went off to work on Linux and stayed there even after BSD was deemed legal."
There is some truth to that. And who knows where BSDs might have been if the lawsuit never happened.
However, I think Linux has always has and till today has better leadership, and management compared to OpenBSD.
I also think GPLv2 was another good that happened to Linux. It just creates an irresistible force to contribute back. With *BSD, a company might contribute back or it may not.