Santos and Cappelletti do still have their very good days. Last Sunday was one. The Patriots, as Brady put it, played their most complete game of the season in a 41-23 victory at Denver, and coincidentally, it was Santos and Cappelletti’s best broadcast of the season. While there were occasional delayed identifications of pass receivers and the down and distance didn’t always agree with what the television screen showed, mistakes were not egregious. And Santos’s call of Chad Ochocinco’s long-awaited first touchdown as a Patriot was outstanding. “Guess who?’’ he boomed. “Chad … Ocho … CINCO!’’ expertly drawing out the syllables to match the magnitude of the moment.