Who delivered the final blow?

[Boromir88]

Thanks Fordim, for going through with it.

I think the biggest question comes in was, Sauron "mortally" (as in his body) wounded by Gil-galad and Elendil? Or was he not "dead" until Isildur cuts the Ring from his finger?

Isildur boasts that he delivered the final blow, but again this could be nothing more than him bragging. (And I can certainly see Isildur as the bragging type).

So, the biggest question is. Would Sauron have been able to recover (meaning his physical body wasn't "mortally wounded") if Isildur hadn't cut off the Ring?

I agree with Farael, because to me this quote here...

Then Sauron was for that time vanquished, and he forsook his body, and his spirit fled far away and hid in waste places; and he took no visible shape again for many long years.

suggests that Sauron's spirit didn't leave his body until after Isildur cut off the Ring?

However, I think there's other quotes referring to Elendil and Gil-galad as "overthrowing" Sauron. So, really, it just seems like a toss-up. Whether Sauron's body was dead before Isildur cut the Ring, and perhaps his spirit just decided to leave it's "dead body" after Isildur cut off the Ring. Perhaps, his body was already "dead" before Isildur cut off the Ring, his spirit just decided to leave after the Ring was cut off?