Darwin recognized the gaping hole in his theory - the absence of an earth teaming with transitional fossils. Gould and Dawkins admitted as much in my earlier post from last night.
Darwin recognized this as a possible objection to his views, but felt he adequately answered it (speciation+divergence+extinction=lack of living transitional forms, incompleteness of the fossil record=lack of fossil transtitionals). To suggest otherwise -- that Darwin considered this an open "gaping hole" -- would be, uh, "duplicitous".