Christopher Alberto- Who is the least ethical character?

Christopher 22–Who is least ethical character: Tim Allerton or Pennington? Ch 18, 26, 27. 

I’d say the least ethical character is Mr.Penington. When Poirot and Race interviewed him, Andrew would be uncomfortable. At times, he would use his handkerchief or just expressed some sort of shocked or astonished expression. They asked Mr. Pennington alot of questions such as information about who could have targeted Mrs. Doyle or if she has mention anything at all to him. Mr. Pennington was extremely nervous and didn’t seem interested in helping whatsoever. At one point, he lies to them and by the end of the interview, both Poirot  and Race glance at eachother as if they are aware of it. In Chapter 26, Fanthorp was interviewed by Poirot. Poirot wanted to know his motive for being on the boat but Fanthorp didn’t really feel like answering at first. Eventually, he revealed that his uncle didn’t trust Mr.Penington because of funds disappearing and later once Mrs.Ridgeway found Mr.Pennington coincidentally in Egypt; there was a possibility that he was desperate enough to attempt to get more signatures from her.