If what Land was doing were illegal, Marvel would have shut him down by now. Comics editors are INCREDIBLY gun-shy people.
So no, he falls on the "legal, but still a no-talent hack" end of the spectrum. Which Kane did for most of his career, though I'm still not so sure about Detective #27. Moot point, obviously.
...I should probably add, as context to the "signed his name to other people's work" thing, that this was common practice in those days, but that Kane was the only guy smarmy enough not to acknowledge it. Siegel and Shuster, Caniff, et al were totally upfront about having to hire work out to others because they didn't have the time to do it all themselves. Kane was the one who swore for decades that he did all the work himself. Even when he dealt with his ghosts, he wouldn't tell them there were other ghosts -- "You're doing these issues, but I'm doing everything else myself."