you guys have covered this all very well. it's an interesting question.
all 5 of our starters will end up 1,000 point scorers ... some much higher. but we're clearly not a good team.
we've always said we want 5 scorers on the floor but never really had it. this year we're seeing the effect of having 5 offensive players on the floor. we're really, really bad defensively. none of our starters prioritize defense, seeing themselves as defense first. I think all of our good teams had guys that did.
it can't all be coaching or scheme. he's won before with less talented players than this. good defensive players can play ANY defense. and it's not all lack of depth/exhaustion unless you're telling me they were already exhausted in November and December because our defense stunk then too.
as for guys playing out of position, I don't see Nick as a guard. he's a true SF, though maybe an inch or two shorter than ideal. Buck's a 2/3. neither is a big forward, but we have a clear top 5 so we're forced to play one there. perfect world, Sal starts from day 1 next year at the 4 and is a defensive presence. Nick, Buck and Khwan rotate at the 2 and 3 spots. Khwan gets some time at the 1 as well. not easy ego-wise to make one of them the 6th man, but it's what the team needs.
and actually ... even though Nathan isn't a top 5 player right now, the team would likely be doing better with him starting and playing more. still have 4 offensive guys out there but longer, better defensively, and helps the bench.