Mojo not really necessary if you find the right spot/field.
My brother and I limited out on Saturday morning by 8am, no mojo set-up.
Went back to the same field/area yesterday afternoon.
Arrived at 1pm and we were both done by 2pm.
No need to even set the mojos out.
Had time to go chase pheasants till sundown.
Scouting and homework will always pay big dividends.
My point is, I always bring the mojos, but I don't always need/use them.