How does the celtics surviving game 5 make you confident the lakers will win game 5, they are 2 completely independent games/series.
Well, that means the Lakers will have enough time to rest and watch both Miami and Celtics playing each other for them (Lakers) to come up with an effective plays to counter their opponent in the Finals.
That's the whole reason why I said the Lakers needs to close out the series, specially If the Celtics survives game 5, and that's just what happened.
They might be completely different series, but I might say the Lakers have the advantage now in terms of the preparation for the next opponent.