Right now, with Tua's age and inactivity, you've gotta go with Peter to outwork him for a decision. He wouldn't stop Tua, but he would do enought to win a clear UD.
[FONT="]I think you are badly underestimating Peter. Todays Peter would win by UD or late TKO against old Tuaman. But prime to prime it could be interesting fight.[/FONT]