So, you’re saying that mixing and matching of ERVs via recombination would not give the false appearance of age, given the assumption of common descent?
Recombinational deletion is a detriment to an ERV getting fixed into a genome, it isn't “mixing and matching” ERV segments. Do you mean transposition, which is where a very “young” ERV still has transpositional ability and can “get up and move” in the genome? That doesn't “mix and match”.