Well, Timbaland often makes his sound more squirrely and eccentric, though not always. "Makes rhythm out of weird sounds" might be what people think of as his signature. But what's grabbing me on "All Eyes" also grabs me on some Timbo tracks, which is that slow crawl across the beat.

As for the LeToya alb, might it be the genre expressing itself through her rather than her expressing herself through the genre? Not that the former can't be just as great as the latter, but it's kinda a matter of chance when the greatness happens, rather than the result of an artistic vision. (Not sure if "genre expressing itself through X" and "X expressing herself though genre" amounts to an actual difference rather than just words that seem good as I type them on the page.)