When the Mets bring up a highly rated prospect, there's always the potential that he'll be the last player to wear whatever uniform number is assigned to him. Given that, the number should be chosen with care. So what number should Jonah Tong be assigned? I looked at the current numerical roster at Baseball Reference. The most suitable numbers that are unclaimed (and unretired) seem to be 21, 40, and 45. I've seen photos of Tong in a number 38 Mets jersey, but that's currently assigned to Tylor Megill. Other good numbers are currently assigned to less prominent players who are currently inactive, such as 19 (Jose Siri), 29 (Jared Young), 30 (Hayden Senger), 32 (Max Kranick), 33 (A.J. Minter), 49 (Chris Devenski). I had suggested 30 for Nolan McLean, because he shares a first name (sort of) with Nolan Ryan. For Tong, based on what's outlined above, I'm thinking he'll be a 40.