Continuing on what was said in the spoiler section and thus spoilers below.
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While I definitely agree with the oddness of them not just leaving (especially Jessie and Colt who tried to stop Ken from attacking Grey earlier that day) I do not think Ken or any of the "love interests" are going to actually be conventual love interests Grey will get into a regular enough relationship. I say this as red flags (although smaller ones) are also in Mark's route and both Ken's and Mark's actions are directly pointed out by Grey and/or other characters as being problematic things he should be avoiding. This also wouldn't be the first VN that ends with the "love interests" not actually being love interests but maybe I'm just hoping this isn't another piece of fiction that ignores this kinda stuff.