I L2040 is something like 25% I fund? Definitely more than a small percentage. Given their daily rebalancing, it seems that people in L funds would really get screwed by the FVs (especially the +FVs). At least if you are BAH in I fund, the number of shares of I fund stays the same. But if FVs are applied to the L funds, then your number of shares would necessarily change. Thats a big deal.I fund and sometimes F fund only(just from my observation, don't have any proof of this).
I believe the L funds contain relatively small percentages of the I fund.