Main chases everything so he's a terrific defensive asset in my opinion, in addition to the quality he brings in terms of his power and long distance shooting. He helps us defend from the front.
Holloway's hold-up play is also fantastic and this is helping the players around him get chances. It's also helping us retain possession and take pressure off the defense.
The goals will come for both of them I think, but I wouldn't judge those two on goals alone because of the other qualities they bring.