tumbao - slap on the 3 side

I've noticed a few recordings where the conguero leaves out the slap on the 3 side of the clave before going to the low drum (Marc Anthony, 'El Cantante' for one)
I've never seen it written any other way besides with the slap (either with the same hand or opposing one)
so I was wondering if anyone could comment on that.
I've never seen it written any other way besides with the slap (either with the same hand or opposing one)
so I was wondering if anyone could comment on that.