SCIAG That means including lots of lower-level appearances for Edwards (including the same number of Conference games and over 100 fourth-tier games).
Championship alone, Edwards scores twice as often - but Kelly has mostly been used in a deep-lying role, and has been prolific after being pushed forward this season. Swift beats Edwards as comfortably as Edwards beats Kelly.
If they all played 46 games, we'd expect 3 goals from Kelly, 6 or 7 from Edwards, and 11 or 12 from Swift. The most uncertainty surrounds Kelly, while there's fairly little surrounding Edwards (uncertainty, of course, works both ways).
OK, I was only really looking since 2010 - so it's Championship or above. Data suggests you'd expect about 8 from Edwards, 10 from Swift over an entire season, Kelly 3/4. However, the last two years Edwards has actually improved his entire game all round, and he's getting closer to Swift.
Edwards tends to play deeper than Swift. Kelly deeper than Edwards.