The 1905 LDS edition replaced the nonfinite present participial form speaking with the finite indicative form speaketh. This change was probably an accident, especially when we consider that the preceding clause also has a nonfinite present participle after the word one (“like as one crying from the dead”). The 1911 LDS edition followed the 1905 reading, speaketh, but the 1920 LDS edition restored the correct speaking to the LDS text.
Summary: Maintain in Moroni 10:27 the use of the present participial speaking after one, the reading of the earliest text.