imo, a "hybrid longbow" has fairly aggressive r/d - enough so that the braced bow won't form that classic "D" shape and exhibits reflex in the limb tips.
as examples, a hill longbow, with marginally reflexed limbs, isn't a hybrid and forms a "D" braced limb shape ... whereas a thunderstick moab, with hefty r/d limbs is quite the hybrid longbow. sandwiched between are those mild r/d longbows, such as mohawk, that exhibit "D" braced limbs, however, the "steath" hybrid longbows, such as 21st edge and most acs designs, are quite aggressive r/d and yet form a braced "D" limb shape.
the grip/handle shape has no bearing in this matter.