From what I can see on transfermarkt....
As the main striker he's got 5 goals and 4 assists in 11 games
As a support striker he's got 21 goals and 10 assists in 35 games
As an attacking midfielder he's got 18 goals and 15 assists in 47 games
As a left winger 6 goals and 5 assists in 21 games
As a right winger 5 goals and 3 assists in 12 games
He's not particularly good from out wide, and we've currently got Nunez, Jota and Firmino who all predominantly play centrally. Not that he's not a good player or that you can ever have too many good players....but hard to see where he'd particularly fit into our attack considering at least we'll have Diaz, Nunez, Jota and Salah here next season.
Each of those discreet stats by position are excellent, I reckon.
If 11 goals and 8 assists in 33 games out wide is not particularly good, does that make Diaz from the left worse than not particularly good?
I take your point on squad composition, and thought the same (unless something dramatic and very unexpected happens - eg getting a fee for Firmino in January, moving on from Nunez next summer etc), but I don't think I can agree that it's hard to see where he'd fit into our attack.
I think he looks adept to play more or less all the roles, and hopefully at a level at or above what we've expected there (eg you'd anticipate he'd perform better than Chamberlain on the right side of attack, better than Minamino centrally, better than Origi on the left, and likely more intuitive a fit as a 'supporting striker' than Nunez).
Either way, it's almost certainly not going to happen for us now - I just think that young versatile cohesive and available are good traits to look for when squad building