Personally I think Smart is exactly what this team needs at point - exactly what they need. A no back down, tone setting tough as heck point who will:
1. Do all the dirty work
2. Be the guy drawing the line in the sand for the other team
3. The guy to actually drag Tatum and Brown up to his intensity level - which is where they need to be for this team to achieve it's highest goal.
Smart is a natural in this position - they should give him the keys. It's Brad's "job" to manage Smart and reign him in if/when needed. You need a very switchable defender at the point in today's NBA - that is Marcus Smart.
The only question for me is if Fournier is the ideal fit next to Tatum and Brown (That is assuming you like small ball with Tatum and Brown at 3 and the 4 rather than the 2 or the 3. If you ultimately don't like don't like Tatum and Brown at the 3 and 4 then perhaps we use Fournier, draft picks and a player or two to get a great fit at the PF.
I love Smart at the one with Williams at the 5 and all the athletic dynamism in between.
And I get the "but Smart makes so many bone headed plays" all the time. Again, give him the keys, tell him he can't be "that guy" anymore. He has to reign all that in". This is Stevens job - you yank him every time he does it until he learns. He will learn.
We all bag on Smart (me included) for his bone headed plays. But seriously, how brutal is Jaylen Brown on defense sometimes? He's like a zombie in full sleep walking mode on so many plays, and...we live with it. I'm willing to live with Smart's mistakes out there every bit as much as I'm willing to live with Brown's pathetic lapses on D as well.
Smart at the point. Williams at the five. Get a massive goon behind Williams for when you need it (Howard, Whiteside, maybe Thompson etc...) and one floor spacing center - maybe that's Kornet, 3rd string. Let it roll. We're not far off.