If Barbosa has no pain, he'll get used to that clicking. I had the same thing one year playing tennis and I got used to it.
My point with Tmac is he'll need to end up on a desperate team to produce. Have you had a chance to see him
in the limited minutes he played thus far for the Rockets? Athleticism non-existent. Check out how high he gets 1:07 and 2:12 in the clip. Teams will quickly figure he's no threat and really crowd him on the perimeter making open jumpers a difficult proposition as well.
You can take the gamble that a semi-miracle happens with him, but I'm not buying it.