If Gordon isn't the fourth option we'll have these same discussions about his shot selection too. You don't want him or Marcus being top 3 on your offensive depth chart.
Very good point.
I think the ideal would be that you have a center who can do some playmaking and shot creation, similar to what Horford did, with Tatum-Brown-Gordon on the perimeter, and then have Smart as the starting guard or as the first backup guard.
But the Celts are a long way off from ideal in terms of how they construct the roster.
If Kemba is healthy, then a lineup with him, the Jays, Gordon, and Rob Williams / Theis would probably look pretty good.
Then your bench is Pritchard, Smart, Timelord/Theis, and ....

That's where the trouble is. That morass of Langford-Nesmith-Semi-Grant-Javonte in the place where you'd really like to have a solid backup 2/3 and 3/4.