The Lakers starting 5 today is much better than it was last season at this point. Defensively they've gotten better, no more Radmanovich getting burned on the perimeter, and the overall chemistry has improved now that they've had a year to gel together.
It's unlikely that if Bynum comes back, which I don't think he will, that he will move to the starting lineup. That's fine with me. Let him play with the 2nd unit and hopefully it will help the Lakers stop blowing 10-15 pt leads left and right.
If that happens, no team in the league will be able to keep up with the Lakers for a full 48 minutes. They will be able to just keep coming at teams in waves and waves. What Pop said earlier in the season is exactly right, there is almost no margin for error when playing against the Lakers at full strength. You have to play perfectly to beat them, and only one team in this league is even capable of that kind of mental focus. Unfortunately they do not appear to have the talent to match that this season.