1.what do you mean by fully utilize? or the full power of act? act 4 is the direct result of johnny pulling off the infinite rotation, it is intrinsically tied to infinite spin. there isnt a semi non fully powered version of act 4.
2.yes. but johnny against diego never did the horse thing..he never even used act 4...he literally had act 2 out ready to aim at diego...and after he got hit with the debris off his shooting the wires he shot out act 4...thats a contradiction.
3.oh. well shit.
4.
here.
5.in the actual scene he says the words before even holding up his hands.