Don't think Pep would have signed Trafford if he thought he had reached his potential already. Think Donnaruma being available a few weeks later was too good not to miss.
That being said I also agree Trafford would feel a tad underwhelming
Ipswich put 5 past Sunderland in 2001/02 iirc. Because I remember being amazed at school when I heard the "5 past Sorensen" time joke for the very first time.