Suggestive, or not, interrupted John, "we are most grateful to Monsieur Poirot for elucidating the matter. 
John never said he was thankful to anyone for anything.
mnli hypothesis: John never said he was thankful to anyone for anything. premise: Suggestive, or not, interrupted John, "we are most grateful to Monsieur Poirot for elucidating the matter. 