They forced it too hard with Roman and did dumb shyt like the blue eye contacts and sufferin succotash promos.
Cody came in suited and booted and cut realistic promos and took beatings along the way, while also winning matches. With Roman it was too force fed. Honestly I think it worked out for the best. Many wanted him heel after Philly booed him and the Rock but no way he would have been this fleshed out and confident. Coming back during Thunderdome days as a heel was the perfect time, in the end. Even if 8 years late. It's a GOAT level heel run now.
Only other time could have been after he beat Taker and the this is may yard promo - but again not sure if it would have been this good.