Since no one is running the wishbone, it's pretty important to pass block in the NFL. The NFL average for sacks allowed is slightly above 2 sacks per game. The Texans allowed just over 3 sacks per game. That's not an average performance. If the Texans had gotten an average performance in pass blocking, I doubt we'd hear much complaining about the O-line. And they give an "A" for depth? Even if the Texans sign another O-lineman, they're still a ways from having excellent depth on the O-line.
I think this is the 2nd time these fantasy rankings have popped up here. Hey, I'd love for the Texans to have the #16 O-line in the NFL. You can win with a line like that. They could become that good this year. But they weren't that good last year. I don't think it's the "end of the world" if the Texans wind up standing pat on the O-line. But they must pass block much better in order to be considered an average offensive line. I'd call these rankings premature, at best.
“Sprinkles are for winners” - Flo