Good for Wilson to come up with a creative way to try to get what he wants. I don't know if the offer will be accepted but it's a good try regardless.
That being said, as a father of a 2 year old myself I know a bit about having a small child, and I think Wilson may be jumping the gun a bit with the Pampers unless he knows for a fact that's what Arrington and his wife like. My wife and I tried both Pampers and Huggies as well as a few store brands when my daughter was born and we were not a fan of Pampers. Wilson should have promised the diapers, then gotten the brand Arrington specified if and when the offer was accepted. What's he going to do with 8 boxes of diapers he won't use if he decides he likes Huggies or Target brand better?
Plus, I know Arrington has a pretty good reason for wearing 24 and I can't say I'd fault him for not wanting to give it up. After all, he's not the highest paid guy in the NFL but he can certainly afford to buy diapers.