You're assuming...much as Myra assumes she saw the strangled body Arlena on the beach.
Regarding your statement "Daphne and Kenneth do get together at the end of the movie, that is why Kenneth stays on the island to be with her." Perhaps so, perhaps not. Poirot, Kenneth & Linda aren't shown leaving, and probably stayed to complete their vacations. Nobody's vacation was scheduled to end that day. The Marshalls, Redfern & Poirot had only arrived three days before, the day before the murder. Sir Horace had only arrived the day before (the day of the murder), and he wasn't really there to vacation - he was coming to meet Poirot to get his diamond back. The Gardners & Rex had been there before the others arrived, but we don't know when they had begun their stay.
When Poirot comes down for breakfast the day after the murder, Daphne mentions Sir Horace, Myra, Odell & Rex are leaving early because the place "is turning into a morgue" or something to that effect. She didn't say anything about Kenneth & Linda wanting nor planning to leave. Later, of course, we see Patrick and Christine are leaving as prisoners of the police.
While one may assume or even hope that Daphne and Kenneth do eventually get together, that's not necessarily the reason he's not leaving. Nor do they "get together at the end" - they're shown sitting in the same room with Linda and Poirot, but Kenneth's with Linda some distance apart from Daphne while she dotes on "Brave Monsieur Poirot!"
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