ERV's prove no such thing since virus simply develop attack routines for similar cells. They are located in the same locations because that is the type of cells those ERV's have devloped specific invasion routines for.....
You are confusing Invasion when two separate species lived alongside one another as meaning common descent.
If Virus did not attack the same similar sites, then genetic alteration could never be performed. It would produce random results, not specific results.
The chances that a virus was inserted in the exact same position in similar cells is 100%, since that is exactly why genetic alterations work. They use virus that attack only specific types of cells and insert their genetic alteration into the exact place wanted. If the odds were 1 in 3,000,000,000 as you claim, then genetic alteration of specific cell types would be virtually impossible. So we can discount your numbers as pure hyperbole.....
Notice readers he shys away from a number such as 1 in 3,000,000,000 yet gladly accepts one 10,000 times larger as fact when it comes to the odds of life from non-life..... Numbers made up out of the air to suit their pseudoscientific beliefs. Odds are not a hindrance except when they don't want to believe something....
Anytime an evolutionists starts quoting odds, you can be sure he or she is trying to avoid reality....