Well I think that one could argue that Thompson is an inside presence, since thats where he spends most of his time. However, I get your point. I don't have a problem with Hawes taking an occasional 3 Pt shot. Especially when he's wide open. Actually, if he keeps missing them like he has lately, he'll find himself wide open all the time out there.
I've watched Hawes and Thompson very carefully the last two games. And there's a distinct difference, other than the fact that Thompson doesn't shoot 3 pointers. When Hawes gets the ball in the post, high or low, he hesitates briefly. As though he's undecided what he's going to do. The result is that by the time he decides, he's now being double teamed. And too many times it results in a forced shot, or a turnover.
When Thompson gets the ball in the post, he immediately does something with it. He'll either try and post up his man, step back and shoot a jumper, or try and pass to an open teammate before the passing lanes close. Now you can agrue that Thompson sometimes makes the wrong decision, and maybe doesn't recognize the double team coming from the weak side, but he doesn't hesitate. He's actually reacting to the defense better than Hawes is. And Hawes is more talented in the post than Thompson is.
To me, it looks like Hawes has a lack of confidence in his game. This will sound strange, but, it looks at times that Thompson moves too fast for the game. But with Hawes, it looks at times that the game is moving too fast for him. If the latter is true, then it means he's thinking too much instead of just reacting. The NBA is tough. You can't throw thought completely out the window. But at the same time, you can't let it dominate your game. And I think Hawes tends to be too cerebral. Practice, practice and more practice. And then get you butt down low and practice in the games.