Welbeck, who was United's goalscorer in the first leg, and preferred ahead of Wayne Rooney in the second leg of their Champions League defeat by Real Madrid, has made giant strides over the past month, proving that not all his best performances have been reserved for the international stage.
Yet Robson accepts the 22-year-old still has work to do, and Robson said: "A few of the younger lads have progressed really well this season. But it was a measure of how well Danny has come on that the boss (Sir Alex Ferguson) put him in the team ahead of Wayne Rooney last week."
After all, that header in the Bernabeu remains one of only two goals for Welbeck this season.
That is fewer than Rafael, Jonny Evans and Patrice Evra, let alone top-scorer Robin van Persie, Javier Hernandez and Rooney, the latter two heading for the 20-goal barrier their Dutch team-mate has long since crashed through.
And that is the area Robson believes Welbeck must improve if present progress is to continue.
Speaking at the launch of the 'Legends are Back' game between Manchester United and Real Madrid, which will take place at Old Trafford on June 2, Robson added: "That (naming him ahead of Rooney) was such a big decision but Danny has all the attributes you need, apart from being a natural finisher.
"The good thing about it is that is an area you can work on and improve. And I know Danny will do that because he is a keen lad with such a great mentality towards the game."
As England's top scorer in 2012 and one of five players nominated for Three Lions' player of the year, Welbeck, to an extent, left Rooney in the shade last year.
Not in terms of personality, though. As the foremost player of his generation, Rooney has been the centre of attention, for good and bad, for over a decade now.
Source: PA
Source: PA