It is actually ironic how "United DNA" Ole starts only one relatively young player that he signed (AWB). And even here there is no certainly that he is good enough and we were chasing a 31 year old Trippier for his position. Other young players that he signed are either on loan/reserves (Amad, Pellistri) or benched (VdB, Sancho) or sold (James). Other starters that he signed (Maguire, Varane, Ronaldo, Bruno, Cavani) are peak or past-peak.
With existing players, yes, Ole starts Greenwood, but Jose regularly started thd likes of Rashford and McTominay who were very young at the time.
If Mourinho had the same record as Ole with signing and using youth, we would 100% have threads on here how he does not trust/use youth enough. But with Ole for a long time his background/talk/desire of fans to have new Fergie clouded perceptions.