Richard’s suggestion that all common variation was packed into two founding individuals and then recombined afterwards into the patterns we see today is actually found in the YEC literature. (Yes, I spend too much time on these things - sigh). Robert Carter is an example of a YEC who tries to get around the bottleneck/founding with 2 problem this way. The challenge for YECs (and Richard) is explaining the patterns we see in the present day with reasonable recombination events. There is also the issue of drift to intermediate frequencies, because small haplotype blocks are effectively “alleles” that can increase or decrease in frequency like individual variants. Although I think Carter starts with a population of one, since Eve is a clone of Adam (presumably with a subtracted Y and a doubled X). In this case, you have to deal with only two original chromosomes, not four.