Valid points about the cases where a host ‘body’ is seen in multiple cases. This was also done with Lawrence / El Lazo. I suppose I just thought maybe Ford had some fondness for an original host/character where he’d keep that character but that body template got reused. That isn’t really based on any supporting evidence though.
So I would agree if a host body is never duplicated or used more than once at a time in the park then that would leave the door open for the multiple timelines.
I also agree with you in that I find the multiple timelines completely uninteresting in terms of writing and plot.