I think you are wrong, because "depth chart until 4th Q means use the lineup(starts) until 4th Q and then use the backup. It is or not?
No, it means "use the depth chart until the 4th and then do whatever you think is best". Or at least that's what I think.
Either way, if something is buggy we don't know how it's going to behave anyhow, I guess.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."