Among the U23 forwards in the top 4 leagues he has the most consistent goal scoring record over multiple seasons (if you expand to top 5 than he would just trail just Mpabbe).
Last 3 years in league for Leipzig he has scored 21 in 31 (2 years ago), 13 in 32 (1 year ago) and this year 11 in 19. That is a .55 goal to start average in league the last 3 years.
In Europe he has 8 goals in 14. Internationally he has 9 in 23 (I know was not present in the world cup, but you could say that for the whole German squad, his youth scoring records were off the charts)
So looking at this I was try to see if he maybe just takes advantage of bad opponents? So how does he do vs common German league Europe teams, Bayern, BvB, Schalke, Leverkusen, Gladbach. This year he has 2 goals in 6 matches vs those, last year 4 in 10 and the year before 6 in 9 matches. All together this is 12 in 25 matches, pretty much in line with his overall scoring. I will also say he doesn't seem to miss many starts, doesn't seem like a Bale type athlete who gets constant muscle problems.
For reference only a few seasoned forwards regularly exceeded .6 goals a game in top 4 leagues, e.g., Messi, Ronaldo, Kane, Suarez, Lewi, Aguero, Griezmann, PEA, Higuan, Cavani, Immobile, Neymar
Werner last 3 years are in the company of Icardi, Lukaku, Bale & Dzeko career scoring proficiency.
His ratio is ahead for Dybala, Mane, Jesus, Insigne, Benzema, Rashford, Lacazette, Sanchez, Costa, Morata, Rodrigo & Manduzikic, granted not all are number 9s but Werner himself isn't exclusively a 9.
I checked in assists per goal, and his assists per goal are in line with Lukaku & Dzeko. Not great but nor on the surface does it look overly selfish shot happy (Icardi is a major negative outlier here, Jesus, Immobile & Jovic are pretty bad in this regard too).
So the metrics in goal scoring look promising. On the surface of u23 CFs or hybrid forwards only Mpabbe (ahead in goals and assists, not like when didn't know from observation either) really stands out as a better bet for future productivity. Hard to find another he doesn't look closer to a sure thing for continued productivity. Of course that doesn't mean he is Barca quality--things like link up play, fast mental processing, field sense & touch are critical to thriving at Barca. Or perhaps he can't take the last 3 years performance for Leipzig and come close to replicate in say La Liga or the EPL, but there is a reason top clubs like Liverpool and Bayern are fishing around.
