Do not depend on editing in the final seconds before lock because it may not apply, even if you get the edit confirmed green check mark. Tonight I submitted a lineup edit approximately 10 seconds before lock, got the edit confirmed green check mark, but the edit did not apply. Draft Kings support says the edit was made 5 seconds after lock which is false. Luckily for me late season NBA DFS is a lottery and I lose no matter what so this didn’t cost me much.
Also about a week ago I submitted a lineup edit about 10 seconds before lock and it was a perfectly legal edit but the edit got declined.