Hang on - there is no way either of the two will cross the 15% threshold in any state today so as to obtain any new delegates to direct. So, at least in that sense, the votes for them are irrelevant.
Let me clarify with a hypothetical example. This does not necessarily reflect my own voting choice, but could help close this out.
Let's say you are/were a Buttigieg supporter and planned to vote for him. However, your second choice is not Biden (could be anyone else).
If you know that Buttigeig is out and his existing delegates will either go to Biden (or go their own way), then you may want to just vote directly for your number 2 choice.
Then you are avoiding the (even small risk) that he would pass the 15% threshold anywhere today.
Does this make sense now? If not, we can just agree to disagree on potential delegate dynamics in a race with attrition.
It's interesting but kind of an arcane and complicated voting process as well.
Let's just see tonight if he indeed get 0 votes and 0 delegates.