Tuchel said he used his first two England camps to learn, but from now on in camps three, four and five it would be about increasing competition, then narrow down his squad.
So no wonder England's head coach was beaming broadly as he departed his media briefing after the most satisfying display since he succeeded Sir Gareth Southgate.
England became the first side to score five goals in an away competitive match against Serbia, and the first overall since a Rest of Europe XI in a September 1964 friendly who won 7-2.
And they have now won eight competitive games in succession, goalkeeper Jordan Pickford keeping his seventh straight clean sheet.
Madueke and defensive pair Ezri Konsa and Marc Guehi all scored their first England goals on a landmark night.
The good news arrived in bundles for England and Tuchel.
Tuchel could almost gorge himself on the food for thought this game offered him.
England were warned the atmospheric Rajko Mitic Stadium would be hostile territory, with the players making the 240-metre walk down the arena's famous tunnel.
Instead, England silenced Serbia's fans from the start, dominating possession, giving those expectant supporters no chance to turn up the volume.
There were some unsavoury incidents.
The game was stopped in the first half when green lasers were shone at Konsa, while there was an outbreak of fighting among the home fans in the second half, with some supporters protesting against Serbian president Aleksandar Vucic.
Serbia and their usually feverish supporters were beaten from the moment captain Harry Kane put England ahead, the all-time record goalscorer showing there are still no serious contenders for his place with his 74th goal in 109 internationals, a remarkable record.
No such problems for Tuchel and England, who delivered the sort of dazzling performance and statement victory their supporters have been waiting for since his appointment.