I thought I'd add a little more understanding to the reason we try to play Lin and Harden separately--aside from what we already know (redundant skill set, need for a second unit leader/scorer, etc.)
When you look at their shot charts each player is best utilized on the left side of the court. Unfortunately, there can be only one.
Let's start with Harden' chart.
His bread and butter is pretty obvious. Let's move on to Lin.
Well, that's problematic. They both excel in the same parts of the court. Just to make sure it's not a fluke--let's look at a chart showing his last 30 days worth of games--most of which were as a starter and not a reserve.
Consistent....and unfortunate. Let's look at the last two games to further support what we're looking at--the two without Mr. Harden.
San Antonio:
Here, we see he stuck to his usual right side of the floor and shot 5-13. He still posted a nice 18-8 with 3 to's.
Dallas:
He shifted to the left and sure enough he shoots 8-14 for 18 points with 7 assists and 2 to's. Heck, he even threw in 7 rebounds.
This is the crux of the problem when trying to play Harden and Lin together. Unless the coaches can devise some kind of offense that uses motion and screens to get open shots from the left wing for either player (not likely) one of the two gets relegated to their weak side and are significantly less effective.
There's good news. As both are highly coordinated athletes they should be able to correct this deficiency through practice and training. Since I presume Morey, McHale, and Co. are smarter than myself I also presume they are already fully aware of this and have plans. Here is the million dollar question: is it better to train them to compliment each other or is it better to go find a guy who fits naturally?
Speaking of fitting in naturally, check out Parsons' shot chart for this year. Yin, meet Yang.
...and here is Jones' chart:
In case anyone is curious, Beverley is disappointing all over the floor.