Lin is no Kobe, that's for sure. Bryant is an excellent passer, Cowherd acknowledges as much. It's pretty clear that Lin can play efficiently and effectively, so I think Lakers will keep him on board next year. At some point, Lakers will want to get a more consistent, solid PG if they can. Rondo may very well fill the starting role, quite possible.
Every player has bad nights. Lin's 0-10 night wasn't the specific concern. It's that he's highly inconsistent, has already had three games in which he wasn't able to hit a single field goal, and has had multiple games where he's looked extremely tentative and diffident. If his shot isn't falling, why not focus more on the defensive end? Why not get your teammates better looks?
Lin shouldn't have the exact same assist numbers as Kobe. In fact, Kobe's assist numbers would be higher had Wes and Boozer not fumbled the majority of nifty passes Kobe sent their way. I can't say the same for Lin. He dribbles the ball past half-court, and largely either passes it to Kobe or hands it off to Hill, retrieves it, acts like he's going to shoot, and either turns the ball over or passes it to someone else. I want to see Lin penetrating the defense and either scoring at the rim or dishing it out to a cutter / open man. He needs to regain confidence in his shot.
Thus far, there is not a single aspect of Lin's game that of which I can point and say, "he's definitely going to bring that today regardless of his other struggles." If Kobe has a bad shooting night (and I've seen some people comparing Kobe's bad shooting nights to Lin's the other night), you can be damn sure he's going to have 15 rebounds, 12 assists, or extra effort on the defensive end (well, at least pre-Achilles injury). He refuses to give up regardless of an abysmal shooting performance.
Lin lacks the aggressiveness and mental fortitude. I feel it's best he comes off the bench and faces competition similar to his own. Most of his assist numbers have came when he was paired with the bench (specifically Davis/Sacre) anyways.
I don't think Coach Scott decides Bryant's minutes. That's up to Kobe. He plays according to how he feels, for example when he stayed in the Wizards game after bumping knees. I don't think he should have been playing down 20 with 3 minutes left.
The mismanagement Scott made there was leaving Kobe in during that entire run.