Oh yeah, last chapter I did have this inkling: "Huh, wouldn't it be funny if Nishijima, the guy who died first, was actually Rascal?", and then I proceeded to forget this thought 5 seconds later. So the head was a prop after all.
welp, i kinda guessed it from the start, it was obvious but it was just twisting and twisting around, his backstory of needing money for the sister was sus when the smol girl came around.
too much murder mystery scenarios and conan helps wonders.