That startled me, but the OS is usually crap on such matters so I checked YouthHawk which is more reliable. For overall games played which is PL2 (U23s league) and the various tournaments this season it gives the following for : Total starts, sub appearances, total goals scored :To be fair, the OS says Duffus has 4 goals in 2 starts and Dyson has 6 in 6 starts so they haven't done badly really.
Dyson : 10 starts , 6 subs, 7 goals
Duffus. : 2. , 9 , 2
And for interest
Niasse 7 , 0, 7
DCL : 10, 0 , 4.
Both Duffus and Dyson are out of contract come June, I'd be very surprised if they are given extensions.