Also you have to remember that there were three Cells. The Cell that became perfect that they are fighting came from a timeline where he had everyone's dna but 16 and 17 was killed which is why he took that version of Trunk's time machine to come to this timeline to absorb 16 and 17 to become perfect.
Right but did he have Frieza's DNA I do not ever recollect any of them mentioning it...