Would it be possible if you had #5 and#7 injectors switched could create hydrolock?

No. Not just by changing injectors. Hydrolock is from a catastrophic failure of a head gasket, I say catastrophic because it would have to be more than just like an ordinary head gasket blowing a little hole and allow coolant in to the combustion chamber. It wouldn't happen fast enough. More likely a cracked block actually to let that much coolant in that quickly, in order to hydrolock both valves must be closed on a compression or power stroke. But your question? again. no, simply changing 2 injectors would not do it

a leaking injector fillin' the cylinder up could make it dead-head tho~

Yeah judge, it sure can, but I have been following and trying to help Oben, he had so much coolant in there with valves closed it seized his motor, but not gas, coolant

ooooof~