Evidence? There isn't really any skill feats on the profile.
Always forget about act 1 and 2, but sinse spy know about them he could use the
Cloak and Dagger to stay invisible, all he need to do is wait a good oportunity, uncloak, shoot and re cloak or get the Dead ringer in hand and wait to be "Killed" by koich ivisible ghost
Knowing they exist and knowing which one is out, what they're doing, where they are, etc is a completely different thing, given they, too, are invisible,
always.
They don't make sound, can't be seen and can even fly and phase, for all intents and purposes, they have the better stealth physiology.
You say all he has to do is wait for a good opportunity, but when would that be? What if Koichi shuts himself off in a building and lays traps? And in that same vain, why can't Koichi do the same?
It was said that uncloaking makes an audible sound ealier in the thread, why wouldn't that tip the Stands off to his presence?
Koichi doesn't kill so that's useless, he'll cripple or incap, Act 1's Empath Manip for example, if struck, Spy has no way around it and would basically just give up.
and about he blocking the shoot, we are talking about a surprise shoot, even trough Koich survived getting donutted he would have died If he wasn't healed, all spy need is to keep cloaking and unkloaking with the likes of
Cloak and Dagger to stay hidden and atack
I didn't say he survived a donut, in fact, I said that's like the only thing we've seen actually put him down. It being a surprise attack doesn't mean much if the Stands spot him from 100m away pulling out a gun to shoot or whatever, reminder, Koichi has used them before to go 50m into the air to scan his surroundings for a large distance, in fact, he's done so in every major fight he's been in from Yukako, to Kira.
If he unveils himself and doesn't actually kill Koichi, all he did was reveal his location and now Koichi is gunning for him.
Spy would be better off laying traps that aren't actually easy to spot while invisible and then **** off and wait for them to proc, maybe he could snipe him, but Morioh lacks any tall buildings and has a lot of closed-off buildings, or empty fields.
Which also begs the question, where in Morioh are they fighting? I doubt it'd be a populated area given Koichi wouldn't want to risk civilians getting involved so he'd probably move the fight away from crowded locations if possible.
Would sapping random eletronics in morio give Spy
Diamondback crits?
Do crits matter? If he lands a solid blow on Koichi where it matters like the head or chest, a crit or not isn't really going to change much, and when it comes to the Stands, a crit or not isn't going to change the fact they can block it. Excluding Act 1 anyway.