I mean the one starting with a letter and 9 digits.
Ok, I don't think that I understand your theory correctly because we can compare between the numbers in many different ways.
But I'll tell you the situation and try to compare between the last 4 digits and the last 2 digits.
Person #1 : got DM
Last 4 digits are higher than the others.
The last 4 digits start with 2
Person #2: still in process
Last 4 digits is Lower than the first person but higher than the third person. That last 4 digits start with 1
Person #3: got DM
Last 4 digits is lower than the others. The last 4 digits start with 1
But if want to compare using only the last 2 digits, then the second person (still in process ) have the highest numbers.