I believe you just made my point for me, MT. "unidentified" sources saying Powell said something is in the end an unsubstantiated charge, like all the others that have been raised by the Democratic opposition. Even if Power has used the word "problematic" in reference to Bolton, we've no idea of the context in which he used it, or even if it was meant as a slight against Bolton. Again, this is unsupported rumors unless Powell himself comes out and explains what he said, why he said it, and what effect those things have on Powell's opinion of Bolton as UN embassador.
BTW, you may or may have not noticed that no Democrats on the committee have asked Mr. Powell's opinion or got his side of the story; it was left to Rebublican committe members to do so. Neither did they ask Mr. Powell to come before the committee to testify. One might ask, "why is that?" Could it be they're not interested in the truth?