The statement that must be true about Yuan's list of numbers is: None of these statements must be true.
The rule "Add 5" starting from any whole number will generate a list of numbers where none of the given conditions are guaranteed to be true for every number.
The numbers may not necessarily be multiples of 5, there may be odd numbers, even numbers, and primes as well.
The rule "Add 5" doesn't impose any specific pattern on the characteristics of the numbers generated.
Therefore, none of the given statements are guaranteed to be true for all possible starting points when using the rule "Add 5" with a whole number.