Not that I doubt you but I'd like to see this outlined because I find that hard to believe. Also, which timeframe are we discussing?
Without eyeballing their drafting history now, I'd wager a guess that the Oilers are one of the worst franchises at developing players outside of the 1st round in the last 30? years. Ironically, I believe Tyler Wright was their draft pick around 30 years ago.
Now going through the last 30+ years, this is who I see outside of the 1st rounder that have been regular NHLers...
1990s
Nobody in 1990
None in 1991 (Wright and Rucinsky were the 1st round picks - meh and pretty good but for other teams)
1992 - Maltby and Gager I guess? (Hulbig was the 1st pick - barf)
1993 - Satan and Vyborny (Arnott was the 1st pick - very good)
None really in 1994 (Bosignore - major barf and Smyth - Legend)
1995 - Laraque (Steve Kelly was the 1st pick - barf)
1996 - Poti and Pisani (Devereaux was the 1st pick - meh)
1997 - Chimera (Riesen was the 1st pick - barf)
1998 - Horcoff (Henrich was the 1st pick - barf)
1999 - Comrie and Semenov (Rita was the 1st pick - barf)
The 90s had a few finds, I'd say 5 that had impacts on the Oilers (Satan, Poti, Pisani, Horcoff and Comrie, throw Laraque in there too) but was offset by horrendous 1st round picks. Arnott and Smyth were the only 1st round hits in a decade.
2000s
2000 - Lombardi (The infamous Russian Tank Mikhnov was the 1st pick - barf)
2001 - Markannen (Hemsky was the 1st pick - finally a good one)
2002 - Stoll and Greene (Niinimaki was the 1st pick - barf)
2003 - Brodziak and Stortini, the rest were fringe guys (MAP was the 1st pick - major barf considering how good this draft was)
2004 - None unless you count Schremp and Reddox (Dubnyk was the 1st pick - very good but not with Edmonton)
2005 - Chorney and Vandevelde I guess (Cogliano - Ok for a 1st but best years away from Edmonton)
2006 - Petry but had best years elsewhere
2007 - Nash who had a career elsewhere (Gagner - Solid career but underwhelming for his draft position)
2008 - Nothing (Eberle - Very good)
2009 - Paajarvi and that's it and I'm being kind with list MPS
2010 - Pitlick (better years away from Edmonton), Marincin and Davidson I guess (Hall - Very good but 1st overalls should be)
2000s had Stoll, Greene, Brodziak for a brief time and Petry that had any sort of impact with the Oilers outside of the 1st. Petry and Stoll were the only ones above Bottom pairing/bottom 6 level in an entire decade.
2010s
2011 - Rieder who had his best years elsewhere (RNH - good and Klefbom - good)
2012 had Gustavsson who had his best years elsewhere and Khaira (Yakupov - barf)
2013 - Nothing (Nurse - Very good)
2014 - Nothing (Drai - Legend)
2015 - Jones, Bear, Marino (Connor - GOAT)
2016 - Desharnais (Pulju - Barf)
2017 - Skinner (Yamamoto - Meh)
2018 - McLeod (Bouchard - Very good)
Yikes, where to start.
The only player of any significance for the Oilers between 2011-2014 was Khaira and he's very bottom of the roster.
2015 was the best drafting but the only real significant player is Marino who did that elsewhere. The Oilers have nothing to show for that trade outside of Foegele through Bear.
Really, the only significant Oiler contributors of that 8 year period is Desharnais, McLeod and Skinner. That's really bad.
Too early to tell
2019 - Lavoie possibly but is a longshot really (Broberg - still hasn't contributed yet)
2020 - Tullio and Savoie are a ways away (Hollway - same as Broberg)
2021 - Wanner is promising, I think Petrov is a longshot (Bourgault - way early obviously but 1st pro season was rough)
2022 - Schaefer helped us get Ekholm so no problem there. The Russian kid had a promising first year
If you look at the last 30+ years in totality, these are the players outside of the 1st that have made an impact of any significance on the Oilers...
Satan, Poti, Pisani, Horcoff, Comrie, Laraque, Petry, Stoll, Greene, Brodziak, McLeod and Skinner.
That's 12 in 33 years and I'd say that out of those guys, the only ones that had more than a bottom 6/bottom pairing role were Satan, Poti, Stoll and Greene for a brief time. This is really bad Fourier,