Here's the lowdown on Via Napoli on the dining plan:
1 TS credit: individual size pizza, drink and dessert. They will NOT allow two people on
DDP to share one individual pizza. You would each have to spend a credit and order your own entree.
2 TS credits: Large pizza, 2 drinks and 2 desserts. They will allow only two people to share this. Any extra persons at the table will have to order their own entree and spend a credit.
4 TS credits: 1/2 meter pizza, 4 drinks and 4 desserts. Again, any party of more than 4 will mean the extra persons will need to order their own entree and spend a credit.
When paying OOP you can order and share whatever you like.