Of course Daniels can play with Rondo. TA was at his best next to Rondo.
And remember, there will be other shooters on the floor. Ray or Pierce. KG and/or Wallace.
I think this is generally accurate.
Plus, let's keep in mind that the regular season doesn't matter all that much in terms of this question: this team could win 65-70 games with J.R. Giddens as the primary backup at the 2/3. So what really matters is the playoffs, which means an 8-9 man rotation.
In that scenario, it means Daniels is essentially the only backup at the 2/3, so whether we call him a 2 or 3 when he's in the game is really inconsequential. What does matter is that regardless who is at the PG spot, he'll be next to great shooters with Ray or Paul. Similarly, at least part of the time, he'll be in House and/or Wallace will be in for Rondo or Perkins.
Finally, I think people are forgetting the simple matter of talent. Even if he's in with a poor shooting lineup of Rondo, Pierce, KG, and Perkins (with 3 non-shooters), let's not discount what that unit could do defensively. Furthermore, let's also not forget that while he doesn't shoot as well as some, Daniels is quite a talented player. He's proven he's a rotation guy on championship-caliber teams. I think the simple fact that teams have to worry about him while he's on the court will make up for a lot of the problems with his shooting range.