Not irrelevant in the least. My $200,000 would stay invested from the beginning, however, your monthly investments would drop to around $900, dropping your net return to a ballpark of $2.8M. Since that is less than half of the investment return on $200,000 invested from the beginning, I would say that is pretty relevant.
Not getting my point, I am saying we could have thrown any number out there and gone from there.