Move content by particular authors to their HomePages.
When appropriate, check for other edits by the same person before deleting.
Do not understand. Please explain.
For example, such a check may reveal that a new page that seems to be an orphan is actually referenced from another page edited by the same person.
For this reason one should always wait at least a day, preferably two days, before seconding deletions. That gives time for the backlinks database to update so you can check that the page isn't referenced from anywhere.
There were recent disputes about DeleteOnceRestoreOnce. So comments about preconditions for overriding this guideline are useful (e.g., If DeleteInsults is really the better choice, spell out and illustrate it with an example).